asynchronous vs serial

asynchronous is not a noun while serial is a noun.

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

asynchronous (noun)	serial (noun)
	a serialized set of programs
	a periodical that appears at scheduled times

asynchronous (adjective)	serial (adjective)
not synchronous; not occurring or existing at the same time or having the same period or phase	pertaining to or occurring in or producing a series
(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	pertaining to or composed in serial technique
	of or relating to the sequential performance of multiple operations
	in regular succession without gaps