harvest vs harvest time

harvest and harvest time both are nouns.

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

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

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