authoritative vs standard

authoritative is not a noun while standard is a noun.

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

authoritative (noun)	standard (noun)
	any distinctive flag
	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

authoritative (adjective)	standard (adjective)
endowed with authority	established or well-known or widely recognized as a model of authority or excellence
having authority or ascendancy or influence	conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind
of recognized authority or excellence	conforming to the established language usage of educated native speakers
	commonly used or supplied
	regularly and widely used or sold