stiff vs effectiveness

stiff and effectiveness both are nouns.

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

stiff (noun)	effectiveness (noun)
the dead body of a human being	power to be effective; the quality of being able to bring about an effect
an ordinary man	capacity to produce strong physiological or chemical effects

stiff (adjective)	effectiveness (adjective)
having a strong physiological or chemical effect
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)	effectiveness (adverb)
in a stiff manner
to a great degree