WordNet (r) 3.0 (2006):

blowup
    n 1: a violent release of energy caused by a chemical or nuclear
         reaction [syn: explosion, detonation, blowup]
    2: an unrestrained expression of emotion [syn: effusion,
       gush, outburst, blowup, ebullition]
    3: a photographic print that has been enlarged [syn:
       enlargement, blowup, magnification]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "blowup":
   Photostat, Xerox, Xerox copy, accelerando, acceleration, access,
   aggravation, backfire, bang, beefing-up, blast, blaze of temper,
   blowing up, blowout, blueprint, boom, burst, concentration,
   condensation, consolidation, contact printing, cyanotype,
   deepening, detonation, discharge, enhancement, enlargement,
   eruption, exacerbation, exaggeration, explosion, flare, flare-up,
   flash, fulguration, fulmination, glossy, heating-up, heightening,
   high words, hologram, information explosion, intensification,
   lantern slide, magnification, matte, microcopy, microprint,
   outburst, photocopy, photogravure, photostatic copy, pickup,
   population explosion, positive, print, projection printing,
   redoubling, reinforcement, report, scene, semi-matte, slide,
   speedup, step-up, storm, strengthening, tightening, transparency