WordNet (r) 3.0 (2006):

lunar module
    n 1: a spacecraft that carries astronauts from the command
         module to the surface of the moon and back [syn: lunar
         excursion module, lunar module, LEM]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "lunar module":
   Earth insertion, LEM, LM, apogee, attitude-control rocket,
   ballistic capsule, burn, capsule, deep-space ship, docking,
   docking maneuver, ferry rocket, fuel ship, injection, insertion,
   lunar excursion module, manned rocket, module, moon ship,
   multistage rocket, orbit, parking orbit, perigee, reentry, rocket,
   shuttle rocket, soft landing, space capsule, space docking,
   space rocket, spacecraft, spaceship