maths vs series

maths and series both are nouns.

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

maths (noun)	series (noun)
a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement	(mathematics) the sum of a finite or infinite sequence of expressions
	a periodical that appears at scheduled times
	a serialized set of programs
	(sports) several contests played successively by the same teams
	similar things placed in order or happening one after another
	a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection
	(electronics) connection of components in such a manner that current flows first through one and then through the other