sham vs pretended

sham is a noun but pretended is not a noun.

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

As adjectives, sham and pretended are synonyms defined as:

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

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

sham (adjective)	pretended (adjective)
adopted in order to deceive	adopted in order to deceive

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