WordNet (r) 3.0 (2006):

toothpaste
    n 1: a dentifrice in the form of a paste

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "toothpaste":
   abstergent, cathartic, cleaner, cleaning agent, cleaning solvent,
   cleanser, cleansing cream, cold cream, cream, dentifrice, depurant,
   detergent, diuretic, emetic, enema, gargle, holystone, lotion,
   mouthwash, nauseant, pumice stone, purgative, purge, purifier,
   rinse, shampoo, soap, solvent, synthetic detergent, tooth powder,
   wash