hermit

Short definition from Wiktionary

Noun

1. 1
   A religious recluse; someone who lives alone for religious reasons; an eremite.
2. 2
   A recluse; someone who lives alone and shuns human companionship.
3. 3
   A spiced cookie made with molasses, raisins, and nuts.
4. 4
   A hermit crab.
5. 5
   Any in the subfamily Phaethornithinae of hummingbirds.