stiff vs equipotent

stiff is a noun but equipotent is not a noun.

Word	Noun	Adjective	Verb	Adverb
stiff	Yes	Yes	No	Yes
equipotent	No	Yes	No	No

stiff (noun)	equipotent (noun)
the dead body of a human being
an ordinary man

stiff (adjective)	equipotent (adjective)
having a strong physiological or chemical effect	having equal strength or efficacy
rigidly formal
not moving or operating freely
very drunk
marked by firm determination or resolution; not shakable
strong, vigorous
incapable of or resistant to bending

stiff (adverb)	equipotent (adverb)
in a stiff manner
to a great degree