The Collaborative International Dictionary of English v.0.48:

Gynecology \Gyn`e*col"o*gy\ (j[i^]n`[-e]*k[o^]l"[-o]*j[y^] or
   g[imac]`n[-e]-), n. [Gr. gynh`, gynaiko`s, a woman + -logy.]
   The science which treats of the structure and diseases of
   women. -- Gyn`e*col"o*gist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gynecologist
    n 1: a specialist in gynecology [syn: gynecologist,
         gynaecologist, woman's doctor]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "gynecologist":
   anesthesiologist, cardiologist, chiropodist, dermatologist,
   eye doctor, eye-ear-nose-throat specialist, geriatrician,
   gerontologist, immunologist, internist, neurologist, obstetrician,
   oculist, ophthalmologist, orthopedist, otolaryngologist, otologist,
   pathologist, pediatrician, pediatrist, podiatrist, psychiatrist,
   radiologist, serologist, skin man, specialist