fictitious vs sham

fictitious is not a noun while sham is a noun.

Word	Noun	Adjective	Verb	Adverb
fictitious	No	Yes	No	No
sham	Yes	Yes	Yes	No

As adjectives, fictitious and sham are synonyms defined as:

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

fictitious (noun)	sham (noun)
	something that is a counterfeit; not what it seems to be
	a person who makes deceitful pretenses

fictitious (adjective)	sham (adjective)
adopted in order to deceive	adopted in order to deceive
formed or conceived by the imagination

fictitious (verb)	sham (verb)
	make believe with the intent to deceive
	make a pretence of