The difference between Echo and Sound
When used as nouns, echo means a reflected sound that is heard again by its initial observer, whereas sound means a sensation perceived by the ear caused by the vibration of air or some other medium.
When used as verbs, echo means to reflect off a surface and return, whereas sound means to produce a sound.
Sound is also interjection with the meaning: yes.
Sound is also adverb with the meaning: soundly.
Sound is also adjective with the meaning: healthy.
check bellow for the other definitions of Echo and Sound
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Echo as a noun:
A reflected sound that is heard again by its initial observer.
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Echo as a noun:
An utterance repeating what has just been said.
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Echo as a noun (poetry):
A device in verse in which a line ends with a word which recalls the sound of the last word of the preceding line.
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Echo as a noun (figurative):
Sympathetic recognition; response; answer.
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Echo as a noun (computing):
The displaying on the command line of the command that has just been executed.
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Echo as a noun:
The letter E in the ICAO spelling alphabet.
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Echo as a noun (whist, bridge):
A signal, played in the same manner as a trump signal, made by a player who holds four or more trumps (or, as played by some, exactly three trumps) and whose partner has led trumps or signalled for trumps.
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Echo as a noun (whist, bridge):
A signal showing the number held of a plain suit when a high card in that suit is led by one's partner.
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Echo as a noun (medicine, colloquial):
Echocardiography or echocardiogram.
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Echo as a verb (of a sound or sound waves, intransitive):
To reflect off a surface and return.
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Echo as a verb (transitive):
To reflect back (a sound).
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Echo as a verb (by extension, transitive):
To repeat (another's speech, opinion etc.).
Examples:
"Sid echoed his father's point of view."
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Echo as a verb (computing, transitive):
To repeat its input as input to some other device or system.
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Sound as an adjective:
Healthy.
Examples:
"He was safe and sound."
"In horse management a sound horse is one with no health problems that might affect its suitability for its intended work."
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Sound as an adjective:
Complete, solid, or secure.
Examples:
"Fred assured me the floorboards were sound."
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Sound as an adjective (mathematics, logic):
Having the property of soundness.
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Sound as an adjective (British, slang):
Good; acceptable; decent.
Examples:
"How are you?" - "I'm sound."
"That's a sound track you're playing."
"See that man over there? He's sound. You should get to know him."
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Sound as an adjective (of sleep):
Quiet and deep.
Examples:
"Her sleep was sound."
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Sound as an adjective:
Heavy; laid on with force.
Examples:
"a sound beating"
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Sound as an adjective:
Founded in law; legal; valid; not defective.
Examples:
"a sound title to land"
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Sound as an adverb:
Soundly.
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Sound as a noun:
A sensation perceived by the ear caused by the vibration of air or some other medium.
Examples:
"He turned when he heard the sound of footsteps nowrap behind him.  nowrap Nobody made a sound."
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Sound as a noun:
A vibration capable of causing such sensations.
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Sound as a noun (music):
A distinctive style and sonority of a particular musician, orchestra etc
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Sound as a noun:
Noise without meaning; empty noise.
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Sound as a noun:
, distance within which a certain noise may be heard.
Examples:
"Stay within the sound of my voice."
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Sound as a verb (intransitive):
To produce a sound.
Examples:
"When the horn sounds, take cover."
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Sound as a verb (copulative):
To convey an impression by one's sound.
Examples:
"He sounded good when we last spoke."
"That story sounds like a pack of lies!"
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Sound as a verb (intransitive):
To be conveyed in sound; to be spread or published; to convey intelligence by sound.
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Sound as a verb (intransitive, obsolete):
To resound.
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Sound as a verb (intransitive, legal, often, with ''in''):
To arise or to be recognizable as arising in or from a particular area of law.
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Sound as a verb (transitive):
To cause to produce a sound.
Examples:
"Sound the alarm!"
"He sounds the instrument."
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Sound as a verb (transitive, phonetics, of a vowel or consonant):
To pronounce.
Examples:
"The "e" in "house" isn't sounded."
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Sound as a noun (geography):
A long narrow inlet, or a strait between the mainland and an island; also, a strait connecting two seas, or connecting a sea or lake with the ocean.
Examples:
"Puget Sound; Owen Sound"
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Sound as a noun:
The air bladder of a fish.
Examples:
"Cod sounds are an esteemed article of food."
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Sound as a noun:
A cuttlefish.
Examples:
"rfquotek Ainsworth"
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Sound as a verb (intransitive):
Dive downwards, used of a whale.
Examples:
"The whale sounded and eight hundred feet of heavy line streaked out of the line tub before he ended his dive."
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Sound as a verb:
To ascertain, or try to ascertain, the thoughts, motives, and purposes of (a person); to examine; to try; to test; to probe.
Examples:
"When I sounded him, he appeared to favor the proposed deal."
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Sound as a verb:
Test; ascertain the depth of water with a sounding line or other device.
Examples:
"Mariners on sailing ships would sound the depth of the water with a weighted rope."
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Sound as a verb (medicine):
To examine with the instrument called a sound or sonde, or by auscultation or percussion.
Examples:
"to sound a patient, or the bladder or urethra"
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Sound as a noun (medicine):
An instrument for probing or dilating; a .
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Sound as a noun:
A long, thin probe for sounding body cavities or canals such as the urethra.