WordNet (r) 3.0 (2006):

subhead
    n 1: a heading of a subdivision of a text [syn: subheading,
         subhead]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "subhead":
   banner, banner head, caption, drop head, dropline, epigraph,
   hanger, head, head up, heading, headline, jump head, legend, motto,
   overline, rubric, running head, running title, scarehead, screamer,
   spread, spreadhead, streamer, subheading, subtitle, superscription,
   title, title page