Q:

What is the one word description for someone who likes spicy food? 

If a bibliophile likes books, then what is the -phile word for someone who enjoys eating spicy food? 

A:

Sorry @Dan Bron, someone got there first: Transcendental Capsaicinophilic Society
Quoted in the Economist in 1998, I think a capsaicinophile is the closest you'll get, even if it's not yet in dictionaries.