Nouns

(n)make-believe, pretendthe enactment of a pretense“it was just pretend”

Verbs

(v)feign, sham, pretend, affect, dissemblemake believe with the intent to deceive“He feigned that he was ill”, “He shammed a headache”
(v)dissemble, pretend, actbehave unnaturally or affectedly“She's just acting”
(v)pretendput forward a claim and assert right or possession of“pretend the title of King”
(v)guess, venture, pretend, hazardput forward, of a guess, in spite of possible refutation“I am guessing that the price of real estate will rise again”, “I cannot pretend to say that you are wrong”
(v)make, pretend, make believerepresent fictitiously, as in a play, or pretend to be or act like“She makes like an actress”
(v)profess, pretendstate insincerely“He professed innocence but later admitted his guilt”, “She pretended not to have known the suicide bomber”, “She pretends to be an expert on wine”

Adjectives

(s)make-believe, pretendimagined as in a play“the make-believe world of theater”, “dangling their legs in the water to catch pretend fish”