zoom in vs concentrate

zoom in is not a noun while concentrate is a noun.

Word	Noun	Adjective	Verb	Adverb
zoom in	No	No	Yes	No
concentrate	Yes	No	Yes	No

As verbs, concentrate is a hypernym of zoom in; that is, concentrate is a word with a broader meaning than zoom in:

Other hypernyms of zoom in include center, centre, focus, pore, rivet.

zoom in (noun)	concentrate (noun)
	a concentrated example of something
	a concentrated form of a foodstuff; the bulk is reduced by removing water
	the desired mineral that is left after impurities have been removed from mined ore

zoom in (verb)	concentrate (verb)
examine closely; focus one's attention on	cook until very little liquid is left
	make denser, stronger, or purer
	make central
	be cooked until very little liquid is left
	make more concise
	compress or concentrate
	direct one's attention on something
	draw together or meet in one common center