whiffer vs hitter

whiffer and hitter both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiffer	Yes	No	No	No
hitter	Yes	No	No	No

As nouns, hitter is a hypernym of whiffer; that is, hitter is a word with a broader meaning than whiffer:

whiffer: a batter who strikes out by swinging at and missing the third strike
hitter: (baseball) a ballplayer who is batting

Other hypernyms of whiffer include batsman, batter, slugger.

whiffer (noun)	hitter (noun)
a batter who strikes out by swinging at and missing the third strike	(baseball) a ballplayer who is batting
	someone who hits