stiff vs potent

stiff is a noun but potent is not a noun.

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

As adjectives, stiff and potent are synonyms defined as:

Other synonyms of stiff include strong.

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

stiff (adjective)	potent (adjective)
having a strong physiological or chemical effect	having a strong physiological or chemical effect
rigidly formal	(of a male) capable of copulation
not moving or operating freely	having great influence
very drunk	having or wielding force or authority
marked by firm determination or resolution; not shakable
strong, vigorous
incapable of or resistant to bending

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