The Collaborative International Dictionary of English v.0.48:

spacecraft \space"craft\, n.
   a vehicle capable of travelling in or into outer space; at
   present, all such vehicles are powered by rocket engine.
   [PJC]

WordNet (r) 3.0 (2006):

spacecraft
    n 1: a craft capable of traveling in outer space; technically, a
         satellite around the sun [syn: spacecraft, ballistic
         capsule, space vehicle]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "spacecraft":
   ATDA, ATS, Alouette, Anna, Apollo, Ariel, Atlas-Score,
   Biosatellite, Comsat, Cosmos, Courier, Diapason, Discoverer, ERS,
   Early Bird, Earth insertion, Echo, Elektron, Explorer, GATV,
   Gemini, Injun, Intelsat, LEM, LM, Lofti, Luna, Lunar Orbiter,
   Lunik, Mariner, Mars probes, Mercury, Midas, Nimbus, OAO, OGO, OSO,
   Pageos, Pegasus, Pioneer, Proton, Ranger, Relay, Samos, San Marco,
   Secor, Sputnik, Surveyor, Syncom, Telstar, Transit, Vanguard,
   Viking, Voskhod, WRESAT, Zond, apogee, artificial satellites,
   attitude-control rocket, ballistic capsule, burn, capsule,
   deep-space ship, docking, docking maneuver, ferry rocket,
   fuel ship, injection, insertion, lunar excursion module,
   lunar module, manned rocket, module, moon ship, multistage rocket,
   orbit, parking orbit, perigee, reentry, rocket, shuttle rocket,
   soft landing, space capsule, space docking, space rocket,
   spaceship