baritone vs singer

baritone and singer both are nouns.

Word	Noun	Adjective	Verb	Adverb
baritone	Yes	Yes	No	No
singer	Yes	No	No	No

As nouns, singer is a hypernym of baritone; that is, singer is a word with a broader meaning than baritone:

Other hypernyms of baritone include vocaliser, vocalist, vocalizer.

baritone (noun)	singer (noun)
the second lowest brass wind instrument	a person who sings
the second lowest adult male singing voice
a male singer

baritone (adjective)	singer (adjective)
lower in range than tenor and higher than bass