monotonic vs maths

monotonic is not a noun while maths is a noun.

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

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

monotonic (adjective)	maths (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