WordNet (r) 3.0 (2006):

peewee
    n 1: disparaging terms for small people [syn: runt, shrimp,
         peewee, half-pint]
    2: small olive-colored woodland flycatchers of eastern North
       America [syn: pewee, peewee, peewit, pewit, wood
       pewee, Contopus virens]

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "peewee":
   Lilliputian, Tom Thumb, bairn, bantam, banty, bitsy, bitty,
   brownie, button, cherub, child, chit, darling, diminutive, dwarf,
   dwarfish, elf, featherweight, fine, fingerling, gnome, homunculus,
   innocent, itsy-bitsy, kid, kitten, lamb, lambkin, lightweight,
   lilliputian, little bugger, little fellow, little guy,
   little innocent, little one, little tad, little tot, manikin,
   midge, midget, mini, miniature, minikin, minnow, minny, minute,
   mite, mouse, nipper, nubbin, offspring, pip-squeak, pony, pygmy,
   runt, shaver, shrimp, slip, small fry, snip, snippet, tad, teeny,
   teeny-weeny, tiny, tit, tot, wart, wee, wee tot, wisp