The Collaborative International Dictionary of English v.0.48:

noncom \noncom\ n.
   A noncommissioned officer; a military officer appointed from
   enlisted personnel.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

noncom
    n 1: a military officer appointed from enlisted personnel [syn:
         noncommissioned officer, noncom, enlisted officer]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "noncom":
   NCO, acting corporal, acting sergeant, centurion,
   chief warrant officer, color sergeant, corporal, first sergeant,
   havildar, lance corporal, lance sergeant, master sergeant,
   mess sergeant, naik, noncommissioned officer, platoon sergeant,
   sarge, sergeant, sergeant first class, sergeant major,
   staff sergeant, technical sergeant, top sergeant, topkick,
   warrant officer