nexus vs series

nexus and series both are nouns.

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

As nouns, series is a hypernym of nexus; that is, series is a word with a broader meaning than nexus:

nexus (noun)	series (noun)
a connected series or group	(mathematics) the sum of a finite or infinite sequence of expressions
the means of connection between things linked in series	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