impatient vs patient

impatient is not a noun while patient is a noun.

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

impatient (noun)	patient (noun)
	the semantic role of an entity that is not the agent but is directly involved in or affected by the happening denoted by the verb in the clause
	a person who requires medical care

impatient (adjective)	patient (adjective)
restless or short-tempered under delay or opposition	enduring trying circumstances with even temper or characterized by such endurance
(usually followed by `to') full of eagerness