invalid vs fallacious

invalid is a noun but fallacious is not a noun.

Word	Noun	Adjective	Verb	Adverb
invalid	Yes	Yes	Yes	No
fallacious	No	Yes	No	No

invalid (noun)	fallacious (noun)
someone who is incapacitated by a chronic illness or injury

invalid (adjective)	fallacious (adjective)
having no cogency or legal force	involving deception
no longer valid	based on an incorrect or misleading notion or information
	containing or based on a fallacy

invalid (verb)	fallacious (verb)
injure permanently
force to retire, remove from active duty, as of firemen