WordNet (r) 3.0 (2006):

equal to
    adj 1: having the requisite qualities for; "equal to the task";
           "the work isn't up to the standard I require" [syn:
           adequate to(p), capable, equal to(p), up to(p)]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "equal to":
   able, adequate, alert for, ample, au fait, barely sufficient,
   capable, commensurate, competent, corresponding, decent, due,
   effective, effectual, efficacious, efficient, enough, fit, fitted,
   fitted for, good, good enough, journeyman, loaded for, minimal,
   minimum, plenty, plenty good enough, prepared for, productive,
   proficient, proportionable, proportionate, qualified, ready for,
   satisfactory, satisfying, substantial, sufficient, sufficient for,
   sufficing, suitable, suited, up for, up to, up to snuff,
   well-fitted, well-qualified, well-suited, worthy