WordNet (r) 3.0 (2006):

baby grand
    n 1: a small grand piano [syn: baby grand, baby grand piano,
         parlor grand, parlor grand piano, parlour grand,
         parlour grand piano]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "baby grand":
   Klavier, Steinway, cembalo, clarichord, clavicembalo, clavichord,
   clavicittern, clavicymbal, clavicytherium, clavier, concert grand,
   cottage piano, couched harp, dulcimer harpsichord, grand,
   grand piano, hammer dulcimer, harmonichord, harpsichord, manichord,
   manichordon, melodion, melopiano, monochord, pair of virginals,
   parlor grand, pianette, pianino, piano, piano-violin, pianoforte,
   sostinente pianoforte, spinet, square piano, upright,
   upright piano, violin piano, virginal