WordNet (r) 3.0 (2006):

orate
    v 1: talk pompously

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "orate":
   blah-blah, bombast, debate, declaim, demagogue, elocute, harangue,
   hold forth, mouth, out-herod Herod, perorate, rabble-rouse, rant,
   rave, read, recite, rodomontade, sermonize, soapbox, speechify,
   spiel, spout, tub-thump