asynchronous vs nonsynchronous

asynchronous and nonsynchronous both are adjectives.

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

asynchronous (adjective)	nonsynchronous (adjective)
not synchronous; not occurring or existing at the same time or having the same period or phase	not occurring together
(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