Seer vs Viewer - What's the difference?

As nouns the difference between seer and viewer

is that seer is (seasonal energy efficiency ratio) while viewer is someone that views some spectacle; an onlooker or spectator.

(en noun)

Agent noun of see; one who sees something; an eyewitness.

Someone who foretells the future; a clairvoyant, prophet, soothsayer or diviner.

See sihr.

(en noun)

(en noun)

Someone that views some spectacle; an onlooker or spectator

Someone who watches television

Any optical device used to view photographic slides

(computing) A program that displays the contents of a file of digital images; an image viewer or file viewer