haymaker vs biff

haymaker and biff both are nouns.

Word	Noun	Adjective	Verb	Adverb
haymaker	Yes	No	No	No
biff	Yes	No	Yes	No

As nouns, biff is a hypernym of haymaker; that is, biff is a word with a broader meaning than haymaker:

Other hypernyms of haymaker include clout, lick, poke, punch, slug.

haymaker (noun)	biff (noun)
a hard punch that renders the opponent unable to continue boxing	(boxing) a blow with the fist
a farm machine that treats hay to cause more rapid and even drying

haymaker (verb)	biff (verb)
	strike, usually with the fist