tenor vs singer

tenor and singer both are nouns.

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

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

Other hypernyms of tenor include vocaliser, vocalist, vocalizer.

tenor (noun)	singer (noun)
the pitch range of the highest male voice	a person who sings
the general meaning or substance of an utterance
a settled or prevailing or habitual course of a person's life
the adult male singing voice above baritone
an adult male with a tenor voice

tenor (adjective)	singer (adjective)
of or close in range to the highest natural adult male voice
(of a musical instrument) intermediate between alto and baritone or bass