academic vs theoretical

academic is a noun but theoretical is not a noun.

Word	Noun	Adjective	Verb	Adverb
academic	Yes	Yes	No	No
theoretical	No	Yes	No	No

academic (noun)	theoretical (noun)
an educator who works at a college or university

academic (adjective)	theoretical (adjective)
associated with academia or an academy	concerned primarily with theories or hypotheses rather than practical considerations
marked by a narrow focus on or display of learning especially its trivial aspects	concerned with theories rather than their practical applications
hypothetical or theoretical and not expected to produce an immediate or practical result