[1] : WordNet (r) 2.0

sans serif
     n : a typeface in which characters have no serifs syn: helvetica
see also:
helvetica 

[2] : Moby Thesaurus II by Grady Ward, 1.0

49 moby thesaurus words for "sans serif":
   ascender, back, bastard type, beard, belly, bevel, black letter,
   body, cap, capital, case, counter, descender, em, en, face,
   fat-faced type, feet, font, groove, italic, letter, ligature,
   logotype, lower case, majuscule, minuscule, nick, pi, pica, point,
   print, roman, script, shank, shoulder, small cap, small capital,
   stamp, stem, type, type body, type class, type lice, typecase,
   typeface, typefounders, typefoundry, upper case

Sans Serif >> S Words
Sans Serif, definition of term: Sans Serif
sans+serif_pag1.html

Sans >> S Words
Sans, definition of term: Sans
sans_pag1.html

Serif >> S Words
Serif, definition of term: Serif
serif_pag1.html

Sans Souci >> S Words
Sans Souci, definition of term: Sans Souci
sans+souci_pag1.html