harvest time vs harvest

harvest time and harvest both are nouns.

Word	Noun	Adjective	Verb	Adverb
harvest time	Yes	No	No	No
harvest	Yes	No	Yes	No

As nouns, harvest time and harvest are synonyms defined as:

harvest time (noun)	harvest (noun)
the season for gathering crops	the season for gathering crops
	the gathering of a ripened crop
	the consequence of an effort or activity
	the yield from plants in a single growing season

harvest time (verb)	harvest (verb)
	remove from a culture or a living or dead body, as for the purposes of transplantation
	gather, as of natural products