stiff vs fertile

stiff is a noun but fertile is not a noun.

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

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

stiff (adjective)	fertile (adjective)
having a strong physiological or chemical effect	capable of reproducing
rigidly formal	marked by great fruitfulness
not moving or operating freely	bearing in abundance especially offspring
very drunk	intellectually productive
marked by firm determination or resolution; not shakable
strong, vigorous
incapable of or resistant to bending

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