nonparallel vs asynchronous

nonparallel and asynchronous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonparallel	No	Yes	No	No
asynchronous	No	Yes	No	No

nonparallel (adjective)	asynchronous (adjective)
of or relating to the sequential performance of multiple operations	not synchronous; not occurring or existing at the same time or having the same period or phase
(of e.g. lines or paths) not parallel; converging	(digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself