stiff vs pissed

stiff is a noun but pissed is not a noun.

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

As adjectives, stiff and pissed are synonyms defined as:

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

stiff (adjective)	pissed (adjective)
having a strong physiological or chemical effect	aroused to impatience or anger
rigidly formal	very drunk
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)	pissed (adverb)
in a stiff manner
to a great degree