impatience vs impatient

impatience is a noun but impatient is not a noun.

Word	Noun	Adjective	Verb	Adverb
impatience	Yes	No	No	No
impatient	No	Yes	No	No

impatience (noun)	impatient (noun)
a dislike of anything that causes delay
a restless desire for change and excitement
a lack of patience; irritation with anything that causes delay

impatience (adjective)	impatient (adjective)
	restless or short-tempered under delay or opposition
	(usually followed by `to') full of eagerness