impossible vs hopeless

impossible is a noun but hopeless is not a noun.

Word	Noun	Adjective	Verb	Adverb
impossible	Yes	Yes	No	No
hopeless	No	Yes	No	No

impossible (noun)	hopeless (noun)
something that cannot be done

impossible (adjective)	hopeless (adjective)
not capable of occurring or being accomplished or dealt with	without hope because there seems to be no possibility of comfort or success
(used of persons or their behavior) not acceptable or reasonable	(informal to emphasize how bad it is) beyond hope of management or reform
totally unlikely	certain to fail
	of a person unable to do something skillfully