ordinary vs unexceptional

ordinary is a noun but unexceptional is not a noun.

Word	Noun	Adjective	Verb	Adverb
ordinary	Yes	Yes	No	No
unexceptional	No	Yes	No	No

ordinary (noun)	unexceptional (noun)
(heraldry) any of several conventional figures used on shields
an early bicycle with a very large front wheel and small back wheel
a clergyman appointed to prepare condemned prisoners for death
a judge of a probate court
the expected or commonplace condition or situation

ordinary (adjective)	unexceptional (adjective)
not exceptional in any way especially in quality or ability or size or degree	not special in any way; lacking distinction
lacking special distinction, rank, or status; commonly encountered