whole number vs modulus

whole number and modulus both are nouns.

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

As nouns, modulus is a hyponym of whole number; that is, modulus is a word with a more specific, narrower meaning than whole number:

whole number: any of the natural numbers (positive or negative) or zero
modulus: an integer that can be divided without remainder into the difference between two other integers

whole number (noun)	modulus (noun)
any of the natural numbers (positive or negative) or zero	(physics) a coefficient that expresses how much of a specified property is possessed by a specified substance
	the absolute value of a complex number
	an integer that can be divided without remainder into the difference between two other integers