The difference between Knock and Swap
When used as nouns, knock means an abrupt rapping sound, as from an impact of a hard object against wood, whereas swap means an exchange of two comparable things.
When used as verbs, knock means to rap one's knuckles against something, especially wood, whereas swap means to exchange or give (something) in an exchange (for something else).
check bellow for the other definitions of Knock and Swap
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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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Swap as a verb (transitive):
To exchange or give (something) in an exchange (for something else).
Examples:
"synonyms exchange switch trade"
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Swap as a verb (transitive, obsolete):
To hit, to strike.
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Swap as a verb (transitive, obsolete):
To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
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Swap as a verb (intransitive, obsolete):
To descend or fall; to rush hastily or violently.
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Swap as a noun:
An exchange of two comparable things.
Examples:
"quote-book lang=1819 w Sir Walter Scott w Tales of My Landlord section=The Bride of Lammermoor passage=I e’en changed it, as occasion served, with the skippers o’ Dutch luggers and French vessels, for gin and brandy... a gude swap too, between what cheereth the soul of man and that which dingeth it clean out of his body"
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Swap as a noun (finance):
A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
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Swap as a noun (computing, informal, uncountable):
Space available in a swap file for use as auxiliary memory.
Examples:
"How much swap do you need?"
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Swap as a noun (obsolete, UK, dialect):
A blow; a stroke.