touchstone vs criterion

touchstone and criterion both are nouns.

Word	Noun	Adjective	Verb	Adverb
touchstone	Yes	No	No	No
criterion	Yes	No	No	No

As nouns, touchstone and criterion are synonyms defined as:

touchstone and criterion: a basis for comparison; a reference point against which other things can be evaluated

Other synonyms of touchstone include measure, standard.

touchstone (noun)	criterion (noun)
a basis for comparison; a reference point against which other things can be evaluated	the ideal in terms of which something can be judged
	a basis for comparison; a reference point against which other things can be evaluated