WordNet (r) 3.0 (2006):

nonfiction
    n 1: prose writing that is not fictional [syn: nonfiction,
         nonfictional prose]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "nonfiction":
   article, autograph, brainchild, composition, computer printout,
   copy, document, draft, edited version, engrossment, essay,
   fair copy, fiction, final draft, finished version, first draft,
   flimsy, holograph, letter, literae scriptae, literary artefact,
   literary production, literature, lucubration, manuscript, matter,
   opus, original, paper, parchment, penscript, piece,
   piece of writing, play, poem, printed matter, printout, production,
   reading matter, recension, screed, scrip, script, scrive, scroll,
   second draft, the written word, transcript, transcription,
   typescript, version, work, writing