Other hyponyms of intellectual include
anomalist,
exponent,
alchemist,
aphorist,
bel esprit,
clever clogs,
clever Dick,
decipherer,
decoder,
egghead,
expositor,
expounder,
brain,
brainiac,
Einstein,
genius,
mastermind,
highbrow,
mentor,
bookman,
scholar,
scholarly person,
doubter,
sceptic,
skeptic,
specifier,
subjectivist,
synthesiser,
synthesist,
synthesizer,
idealogue,
theoretician,
theoriser,
theorist,
theorizer,
creative thinker,
mind,
thinker,
thinker,
illusionist,
seer,
visionary,
wonderer.