unglamorous vs commonplace

unglamorous is not a noun while commonplace is a noun.

Word	Noun	Adjective	Verb	Adverb
unglamorous	No	Yes	No	No
commonplace	Yes	Yes	No	No

As adjectives, unglamorous and commonplace are synonyms defined as:

unglamorous and commonplace: not challenging; dull and lacking excitement

Other synonyms of unglamorous include humdrum, prosaic, unglamourous.

unglamorous (noun)	commonplace (noun)
	a trite or obvious remark

unglamorous (adjective)	commonplace (adjective)
not challenging; dull and lacking excitement	not challenging; dull and lacking excitement
	repeated too often; overfamiliar through overuse
	completely ordinary and unremarkable