denominator vs divisor

denominator and divisor both are nouns.

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

As nouns, divisor is a hypernym of denominator; that is, divisor is a word with a broader meaning than denominator:

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