soprano vs singer

soprano and singer both are nouns.

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

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

Other hypernyms of soprano include vocaliser, vocalist, vocalizer.

soprano (noun)	singer (noun)
the pitch range of the highest female voice	a person who sings
the highest female voice; the voice of a boy before puberty
a female singer with the highest vocal range of all the voice type

soprano (adjective)	singer (adjective)
having or denoting a high range