launchpad vs launching pad

launchpad and launching pad both are nouns.

Word	Noun	Adjective	Verb	Adverb
launchpad	Yes	No	No	No
launching pad	Yes	No	No	No

As nouns, launchpad and launching pad are synonyms defined as:

launchpad and launching pad: a platform from which rockets or space craft are launched

Other synonyms of launchpad include launch area, launch pad, pad.

launchpad (noun)	launching pad (noun)
a platform from which rockets or space craft are launched	a platform from which rockets or space craft are launched