divisor vs whole number

divisor and whole number both are nouns.

Word	Noun	Adjective	Verb	Adverb
divisor	Yes	No	No	No
whole number	Yes	No	No	No

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

divisor: one of two or more integers that can be exactly divided into another integer
whole number: any of the natural numbers (positive or negative) or zero

Other hypernyms of divisor include integer.

divisor (noun)	whole number (noun)
the number by which a dividend is divided	any of the natural numbers (positive or negative) or zero
one of two or more integers that can be exactly divided into another integer