pitcher vs twirler

pitcher and twirler both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitcher	Yes	No	No	No
twirler	Yes	No	No	No

As nouns, pitcher and twirler are synonyms defined as:

Other synonyms of pitcher include hurler.

pitcher (noun)	twirler (noun)
the position on a baseball team of the player who throws the ball for a batter to try to hit	(baseball) the person who does the pitching
an open vessel with a handle and a spout for pouring	someone who twirls a baton
(baseball) the person who does the pitching
(botany) a leaf that is modified in such a way as to resemble a pitcher or ewer
the quantity contained in a pitcher