noun

a highly academic or studious person; an intellectual.

the TV egghead who brought science to the masses

intellectual,intellect,bluestocking,thinker,academic,scholar,sage,bookworm,bookish person,highbrow,expert,genius,Einstein,polymath,prodigy,mastermind,brains,bright spark,whizz,wizard,walking encyclopedia,brainbox,clever clogs,boffin,brainiac,rocket scientist,maven