harvest vs fruitage

harvest and fruitage both are nouns.

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

As nouns, fruitage is a hyponym of harvest; that is, fruitage is a word with a more specific, narrower meaning than harvest:

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

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