in series vs nonparallel

in series and nonparallel both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in series	No	Yes	No	No
nonparallel	No	Yes	No	No

As adjectives, in series and nonparallel are synonyms defined as:

in series and nonparallel: of or relating to the sequential performance of multiple operations

Other synonyms of in series include serial.

in series (adjective)	nonparallel (adjective)
of or relating to the sequential performance of multiple operations	of or relating to the sequential performance of multiple operations
	(of e.g. lines or paths) not parallel; converging