knock vs sound

knock and sound both are nouns.

Word	Noun	Adjective	Verb	Adverb
knock	Yes	No	Yes	No
sound	Yes	Yes	Yes	No

As nouns, sound is a hypernym of knock; that is, sound is a word with a broader meaning than knock:

As verbs, sound is a hypernym of knock; that is, sound is a word with a broader meaning than knock:

Other hypernyms of knock include go.

As verbs, sound is a hypernym of knock; that is, sound is a word with a broader meaning than knock:

Other hypernyms of knock include go.

knock (noun)	sound (noun)
the act of hitting vigorously	the particular auditory effect produced by a given cause
negative criticism	the subjective sensation of hearing something
a vigorous blow	the audible part of a transmitted signal
the sound of knocking (as on a door or in an engine or bearing)	(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
a bad experience	the sudden occurrence of an audible event
	a large ocean inlet or deep bay
	a narrow channel of the sea joining two larger bodies of water
	mechanical vibrations transmitted by an elastic medium

knock (adjective)	sound (adjective)
	financially secure and safe
	in good condition; free from defect or damage or decay
	complete; thorough
	(of sleep) deep and complete
	in excellent physical condition
	exercising or showing good judgment
	free from moral defect
	vigorous or severe
	having legal efficacy or force
	logically valid

knock (verb)	sound (verb)
find fault with; express criticism of; point out real or perceived flaws	measure the depth of (a body of water) with a sounding line
knock against with force or violence	utter with vibrating vocal chords
rap with the knuckles	make a certain noise or sound
deliver a sharp blow or push	cause to sound
make light, repeated taps on a surface	announce by means of a sound
sound like a car engine that is firing too early	give off a certain sound or sounds
	appear in a certain way