supposititious vs suppositional

supposititious and suppositional both are adjectives.

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

As adjectives, supposititious and suppositional are synonyms defined as:

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

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

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