intellectual, intellect - a person who uses the mind creatively

anticipant, anticipator - one who anticipates

diviner - someone who claims to discover hidden knowledge with the aid of supernatural powers

fantast, futurist - someone who predicts the future

forecaster, predictor, prognosticator, soothsayer - someone who makes predictions of the future (usually on the basis of special knowledge)

beholder, observer, perceiver - a person who becomes aware (of things or events) through the senses

augur, auspex - (ancient Rome) a religious official who interpreted omens to guide public policy

diviner - someone who claims to discover hidden knowledge with the aid of supernatural powers

prophetess - a woman prophet

sibyl - (ancient Rome) a woman who was regarded as an oracle or prophet