The Collaborative International Dictionary of English v.0.48:

Unguent \Un"guent\ (?; 277), n. [L. unguentum, from unguere,
   ungere, to anoint: cf. F. onguent. See Ointment, and cf.
   Unction, Unctuous.]
   A lubricant or salve for sores, burns, or the like; an
   ointment. --Cowper.
   [1913 Webster]

   Note: An unguent is stiffer than a liniment, but softer than
         a cerate.
         [1913 Webster]

WordNet (r) 3.0 (2006):

unguent
    n 1: semisolid preparation (usually containing a medicine)
         applied externally as a remedy or for soothing an
         irritation [syn: ointment, unction, unguent, balm,
         salve]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "unguent":
   adipose, balm, balsam, blubbery, brilliantine, buttery,
   butyraceous, cerate, chrism, chrismal, chrismatory, cold cream,
   collyrium, cream, demulcent, embrocation, emollient, eye-lotion,
   eyewash, eyewater, face cream, fat, fatty, greasy, hand lotion,
   inunction, inunctum, lanolin, lardaceous, lardy, lenitive,
   liniment, lotion, mucoid, nard, oil, oily, ointment, oleaginous,
   oleic, pomade, pomatum, rich, salve, sebaceous, sleek, slick,
   slippery, smooth, soapy, soothing syrup, spikenard, suety, tallowy,
   unction, unctuous, unguentary, unguentous, unguentum, vulnerary