gainer vs doer

gainer and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gainer	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of gainer; that is, doer is a word with a broader meaning than gainer:

Other hypernyms of gainer include actor, worker.

As nouns, doer is a hypernym of gainer; that is, doer is a word with a broader meaning than gainer:

Other hypernyms of gainer include actor, worker.

gainer (noun)	doer (noun)
a dive in which the diver throws the feet forward to complete a full backward somersault and enters the water feet first and facing away from the diving board	a person who acts and gets things done
a person who gains (gains an advantage or gains profits)
a person who gains weight