literalist (noun) - someone who takes words and ideas at their most basic, primary, or exact meaning [lit-er-uh-list]
BREAKDOWN: LITER- (letter) + -AL (pertaining to) + -IST (one who does)
literalism is a philosophical or artistic commitment to interpret words or idea in their most literal or explicit sense; fidelity to observable fact or what is real
literal (adj) - exactly as stated; read or understood; interpreted in the most basic sense without nuance, metaphor, or liberty; unimaginative or matter-of-fact
literally means exactly or actually if you are being literal, but more often intended to mean in effect or virtually
See also: obliterate
What's the difference between a kleptomaniac and a literalist?
The literalist takes things literally. The kleptomaniac takes things, literally.