mathematics vs disjoint

mathematics is a noun but disjoint is not a noun.

Word	Noun	Adjective	Verb	Adverb
mathematics	Yes	No	No	No
disjoint	No	Yes	Yes	No

mathematics (noun)	disjoint (noun)
a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

mathematics (adjective)	disjoint (adjective)
	having no elements in common

mathematics (verb)	disjoint (verb)
	become separated, disconnected or disjoint
	make disjoint, separated, or disconnected; undo the joining of
	separate at the joints
	part; cease or break association with