conjectural vs suppositional

conjectural and suppositional both are adjectives.

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

As adjectives, conjectural and suppositional are synonyms defined as:

conjectural and suppositional: based primarily on surmise rather than adequate evidence

Other synonyms of conjectural include divinatory, hypothetic, hypothetical, supposed, suppositious, supposititious.

conjectural (adjective)	suppositional (adjective)
based primarily on surmise rather than adequate evidence	based primarily on surmise rather than adequate evidence