procrustean rule vs touchstone

procrustean rule and touchstone both are nouns.

Word	Noun	Adjective	Verb	Adverb
procrustean rule	Yes	No	No	No
touchstone	Yes	No	No	No

As nouns, touchstone is a hypernym of procrustean rule; that is, touchstone is a word with a broader meaning than procrustean rule:

procrustean rule: a standard that is enforced uniformly without regard to individuality
touchstone: a basis for comparison; a reference point against which other things can be evaluated

Other hypernyms of procrustean rule include criterion, measure, standard.

procrustean rule (noun)	touchstone (noun)
a standard that is enforced uniformly without regard to individuality	a basis for comparison; a reference point against which other things can be evaluated