whiffer vs slugger

whiffer and slugger both are nouns.

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

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

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

Other hypernyms of whiffer include batsman, batter, hitter.

whiffer (noun)	slugger (noun)
a batter who strikes out by swinging at and missing the third strike	(baseball) a ballplayer who is batting
	a boxer noted for an ability to deliver hard punches