whelm vs knock out

whelm and knock out both are verbs.

Word	Noun	Adjective	Verb	Adverb
whelm	No	No	Yes	No
knock out	No	No	Yes	No

As verbs, knock out is a hyponym of whelm; that is, knock out is a word with a more specific, narrower meaning than whelm:

Other hyponyms of whelm include devastate, clutch, get hold of, seize, kill, benight, stagger, lock.

whelm (verb)	knock out (verb)
overcome, as with emotions or perceptual stimuli	destroy or break forcefully
to neither fail to meet nor exceed expectation	eliminate
	empty (as of tobacco) by knocking out
	knock unconscious or senseless
	overwhelm with admiration