textbook vs standard

textbook and standard both are nouns.

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

textbook (noun)	standard (noun)
a book prepared for use in schools or colleges	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

textbook (adjective)	standard (adjective)
according to or characteristic of a casebook or textbook; typical	established or well-known or widely recognized as a model of authority or excellence
	conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind
	conforming to the established language usage of educated native speakers
	commonly used or supplied
	regularly and widely used or sold