lunar module vs lunar excursion module

lunar module and lunar excursion module both are nouns.

Word	Noun	Adjective	Verb	Adverb
lunar module	Yes	No	No	No
lunar excursion module	Yes	No	No	No

As nouns, lunar module and lunar excursion module are synonyms defined as:

lunar module and lunar excursion module: a spacecraft that carries astronauts from the command module to the surface of the moon and back

Other synonyms of lunar module include LEM.

lunar module (noun)	lunar excursion module (noun)
a spacecraft that carries astronauts from the command module to the surface of the moon and back	a spacecraft that carries astronauts from the command module to the surface of the moon and back