divisor vs denominator

divisor and denominator both are nouns.

Word	Noun	Adjective	Verb	Adverb
divisor	Yes	No	No	No
denominator	Yes	No	No	No

As nouns, denominator is a hyponym of divisor; that is, denominator is a word with a more specific, narrower meaning than divisor:

Other hyponyms of divisor include aliquot, aliquot part, aliquant, aliquant part.

divisor (noun)	denominator (noun)
the number by which a dividend is divided	the divisor of a fraction
one of two or more integers that can be exactly divided into another integer