WordNet (r) 3.0 (2006):

metrics
    n 1: the study of poetic meter and the art of versification
         [syn: prosody, metrics]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "metrics":
   Stabreim, accent, accentuation, alliterative meter, beat, cadence,
   emphasis, ictus, level of stress, lilt, measure, meter,
   metrical pattern, movement, number, numbers, primary stress,
   prosodic pattern, prosodics, prosody, quantitative meter, rhythm,
   rhythmic pattern, rhythmical stress, scanning, scansion,
   secondary stress, stress, stress accent, stress pattern, swing,
   syllabic meter, tertiary stress, vers libre, versification,
   weak stress