grassroots vs common

grassroots is not a noun while common is a noun.

Word	Noun	Adjective	Verb	Adverb
grassroots	No	Yes	No	No
common	Yes	Yes	No	No

grassroots (noun)	common (noun)
	a piece of open land for recreational use in an urban area

grassroots (adjective)	common (adjective)
fundamental	having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual
of or involving the common people as constituting a fundamental political and economic group	belonging to or participated in by a community as a whole; public
	commonly encountered
	of low or inferior quality or value
	being or characteristic of or appropriate to everyday language
	of or associated with the great masses of people
	to be expected; standard
	common to or shared by two or more parties
	lacking refinement or cultivation or taste