commonplace vs well-worn

commonplace is a noun but well-worn is not a noun.

Word	Noun	Adjective	Verb	Adverb
commonplace	Yes	Yes	No	No
well-worn	No	Yes	No	No

As adjectives, commonplace and well-worn are synonyms defined as:

commonplace and well-worn: repeated too often; overfamiliar through overuse

Other synonyms of commonplace include banal, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite.

commonplace (noun)	well-worn (noun)
a trite or obvious remark

commonplace (adjective)	well-worn (adjective)
not challenging; dull and lacking excitement	repeated too often; overfamiliar through overuse
repeated too often; overfamiliar through overuse	showing signs of much wear or use
completely ordinary and unremarkable