theoretic vs theory

theoretic is not a noun while theory is a noun.

Word	Noun	Adjective	Verb	Adverb
theoretic	No	Yes	No	No
theory	Yes	No	No	No

theoretic (noun)	theory (noun)
	a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena
	a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
	a belief that can guide behavior

theoretic (adjective)	theory (adjective)
concerned primarily with theories or hypotheses rather than practical considerations