fictive vs assumed

fictive and assumed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fictive	No	Yes	No	No
assumed	No	Yes	No	No

As adjectives, fictive and assumed are synonyms defined as:

Other synonyms of fictive include false, fictitious, pretended, put on, sham.

fictive (adjective)	assumed (adjective)
adopted in order to deceive	adopted in order to deceive
capable of imaginative creation