single-valued function vs math

single-valued function and math both are nouns.

Word	Noun	Adjective	Verb	Adverb
single-valued function	Yes	No	No	No
math	Yes	No	No	No

single-valued function (noun)	math (noun)
(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)	a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement