effectiveness vs stiff

effectiveness and stiff both are nouns.

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

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

effectiveness (adjective)	stiff (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

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