criterion vs touchstone

criterion and touchstone both are nouns.

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

As nouns, criterion and touchstone are synonyms defined as:

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

Other synonyms of criterion include measure, standard.

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