harvest vs harvester

harvest and harvester both are nouns.

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

harvest (noun)	harvester (noun)
the season for gathering crops	farm machine that gathers a food crop from the fields
the gathering of a ripened crop	someone who helps to gather the harvest
the consequence of an effort or activity
the yield from plants in a single growing season

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