theoretical vs conjectural

theoretical and conjectural both are adjectives.

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

theoretical (adjective)	conjectural (adjective)
concerned primarily with theories or hypotheses rather than practical considerations	based primarily on surmise rather than adequate evidence
concerned with theories rather than their practical applications