Princeton's WordNet

1. pretense, pretence, make-believe(noun)

   imaginative intellectual play

   Synonyms:
   pretend, pretending, pretence, pretext, pretension, pretense, guise, feigning, make-believe, simulation, dissembling

   Antonyms:
   real, existent

2. make-believe, pretend(adj)

   the enactment of a pretense

   Synonyms:
   pretense, pretence, pretend, make-believe

   Antonyms:
   existent, real

3. make-believe, pretend(verb)

   imagined as in a play

   Synonyms:
   pretend, make-believe

   Antonyms:
   real, existent

4. make, pretend, make believe(verb)

   represent fictitiously, as in a play, or pretend to be or act like

   Synonyms:
   earn, create, take in, pass water, dissemble, relieve oneself, score, lay down, pull in, progress to, prepare, get, stool, make up, hit, arrive at, cook, attain, fix, establish, seduce, defecate, urinate, work, wee, puddle, reach, take, have, pee-pee, pretend, shit, stimulate, pee, get to, construct, act, throw, hazard, form, gain, micturate, take a shit, venture, cause, realise, do, give, crap, affect, take a leak, sham, induce, hold, clear, make water, spend a penny, produce, nominate, wee-wee, ready, piss, name, guess, take a crap, draw, bring in, make believe, constitute, feign, realize, piddle, profess, ca-ca, build, make

   Antonyms:
   real, existent