The term PART OF LEM refers to components of the Lunar Excursion MODULE (LEM), which was a spacecraft used by the Apollo program to land on the moon. The first crossword solution is LUNAR, which is an adjective describing something related to the moon. The second solution is MODULE, which is a type of spacecraft that was used in the Apollo program. The third solution is LUNER, which is another adjective describing something related to the moon.