sophistic vs invalid

sophistic is not a noun while invalid is a noun.

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

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

sophistic (adjective)	invalid (adjective)
of or pertaining to sophists	having no cogency or legal force
plausible but misleading	no longer valid

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