yardstick vs touchstone

yardstick and touchstone both are nouns.

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

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

yardstick: a measure or standard used for comparison
touchstone: a basis for comparison; a reference point against which other things can be evaluated

Other hypernyms of yardstick include criterion, measure, standard.

yardstick (noun)	touchstone (noun)
a ruler or tape that is three feet long	a basis for comparison; a reference point against which other things can be evaluated
a measure or standard used for comparison