standard vs common

standard and common both are nouns.

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

standard (noun)	common (noun)
any distinctive flag	a piece of open land for recreational use in an urban area
an upright pole or beam (especially one used as a support)
the ideal in terms of which something can be judged
a basis for comparison; a reference point against which other things can be evaluated
the value behind the money in a monetary system
a board measure = 1980 board feet

standard (adjective)	common (adjective)
established or well-known or widely recognized as a model of authority or excellence	having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual
conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind	belonging to or participated in by a community as a whole; public
conforming to the established language usage of educated native speakers	commonly encountered
commonly used or supplied	of low or inferior quality or value
regularly and widely used or sold	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