mediocre vs ordinary

mediocre is not a noun while ordinary is a noun.

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

mediocre (noun)	ordinary (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

mediocre (adjective)	ordinary (adjective)
poor to middling in quality	not exceptional in any way especially in quality or ability or size or degree
moderate to inferior in quality	lacking special distinction, rank, or status; commonly encountered
lacking exceptional quality or ability