The difference between Knock and Rap
When used as nouns, knock means an abrupt rapping sound, as from an impact of a hard object against wood, whereas rap means a sharp blow with something hard.
When used as verbs, knock means to rap one's knuckles against something, especially wood, whereas rap means to strike something sharply with one's knuckles.
check bellow for the other definitions of Knock and Rap
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Knock as a noun:
An abrupt rapping sound, as from an impact of a hard object against wood
Examples:
"I heard a knock on my door."
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Knock as a noun:
A sharp impact.
Examples:
"He took a knock on the head."
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Knock as a noun (figurative):
criticism
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Knock as a noun (cricket):
a batsman's innings.
Examples:
"He played a slow but sure knock of 35."
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Knock as a noun (automotive):
Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition or the characteristic knocking sound associated with it.
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Knock as a noun (cycling):
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Knock as a verb (intransitive):
To rap one's knuckles against something, especially wood.
Examples:
"Knock on the door and find out if they're home."
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Knock as a verb (transitive, dated):
To strike for admittance; to rap upon, as a door.
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Knock as a verb (ambitransitive, dated):
To bump or impact.
Examples:
"I knocked against the table and bruised my leg."
"I accidentally knocked my drink off the bar."
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Knock as a verb (colloquial):
To denigrate, undervalue.
Examples:
"Don't knock it until you've tried it."
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Knock as a verb (soccer):
To pass, kick a ball towards another player.
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Knock as a verb (slang, dated, UK):
To impress strongly or forcibly; to astonish; to move to admiration or applause.
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Rap as a noun (countable):
A sharp blow with something hard.
Examples:
"The teacher gave the wayward pupil a rap across the knuckles with her ruler."
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Rap as a noun (uncountable):
Blame (for something), whether or not it results in a conviction.
Examples:
"You can't act irresponsibly and then expect me to take the rap."
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Rap as a noun (informal):
A casual talk
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Rap as a noun (music genre, uncountable):
Rap music.
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Rap as a noun:
A song, verse, or instance of singing in the style of rap music.
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Rap as a verb (intransitive):
To strike something sharply with one's knuckles; knock.
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Rap as a verb (transitive, dated):
To strike with a quick blow; to knock on.
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Rap as a verb (metalworking):
To free (a pattern) in a mould by light blows on the pattern, so as to facilitate its removal.
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Rap as a verb (ambitransitive):
To speak (lyrics) in the style of rap music.
Examples:
"He started to rap after listening to the Beastie Boys"
"He rapped a song to his girlfriend."
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Rap as a verb (informal, intransitive):
To talk casually.
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Rap as a noun:
A lay or skein containing 120 yards of yarn.
Examples:
"rfquotek Knight"
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Rap as a noun (historical):
Any of the tokens that passed current for a halfpenny in Ireland in the early part of the eighteenth century; any coin of trifling value.
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Rap as a noun:
A whit; a jot.
Examples:
"I don't care a rap."
"That's not worth a rap."