monotone vs mathematics

monotone and mathematics both are nouns.

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

monotone (noun)	mathematics (noun)
an unchanging intonation	a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
a single tone repeated with different words or different rhythms (especially in rendering liturgical texts)

monotone (adjective)	mathematics (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