twirler vs baseball player

twirler and baseball player both are nouns.

Word	Noun	Adjective	Verb	Adverb
twirler	Yes	No	No	No
baseball player	Yes	No	No	No

As nouns, baseball player is a hypernym of twirler; that is, baseball player is a word with a broader meaning than twirler:

Other hypernyms of twirler include ballplayer, thrower.

twirler (noun)	baseball player (noun)
(baseball) the person who does the pitching	an athlete who plays baseball
someone who twirls a baton