The Collaborative International Dictionary of English v.0.48:

Realizable \Re"al*i`za*ble\ (r[=e]"al*[imac]`z[.a]*b'l), a.
   Capable of being realized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

realizable
    adj 1: capable of being realized; "realizable benefits of the
           plan"
    2: capable of existing or taking place or proving true; possible
       to do [syn: accomplishable, achievable, doable,
       manageable, realizable]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "realizable":
   achievable, actable, attainable, banausic, compassable, doable,
   effective, effectual, efficient, feasible, negotiable, operable,
   overcomable, performable, practicable, practical, pragmatic,
   superable, surmountable, viable, workable