WordNet (r) 3.0 (2006):

tonal
    adj 1: employing variations in pitch to distinguish meanings of
           otherwise similar words; "Chinese is a tonal language"
           [syn: tonic, tonal]
    2: having tonality; i.e. tones and chords organized in relation
       to one tone such as a keynote or tonic [ant: atonal,
       unkeyed]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "tonal":
   accented, alveolar, apical, apico-alveolar, apico-dental,
   articulated, assimilated, back, barytone, bilabial, broad,
   cacuminal, central, cerebral, checked, chromatic, close, consonant,
   consonantal, continuant, dental, dissimilated, dorsal, droning,
   enharmonic, flat, front, glide, glossal, glottal, guttural, hard,
   heavy, high, intonated, labial, labiodental, labiovelar, lateral,
   lax, light, lingual, liquid, low, mid, monophthongal, monotone,
   monotonic, muted, narrow, nasal, nasalized, occlusive, open,
   oxytone, palatal, palatalized, pharyngeal, pharyngealized,
   phonemic, phonetic, phonic, pitch, pitched, posttonic, retroflex,
   rounded, semitonic, semivowel, soft, sonant, soniferous, sonorous,
   sounded, sounding, stopped, stressed, strong, surd, syllabic,
   tense, thick, throaty, toneless, tonic, twangy, unaccented,
   unrounded, unstressed, velar, vocalic, vocoid, voiced, voiceless,
   vowel, vowellike, weak, wide