maths vs monotonic

maths is a noun but monotonic is not a noun.

Word	Noun	Adjective	Verb	Adverb
maths	Yes	No	No	No
monotonic	No	Yes	No	No

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

maths (adjective)	monotonic (adjective)
	of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value
	sounded or spoken in a tone unvarying in pitch