gliding vs sailplaning

gliding and sailplaning both are nouns.

Word	Noun	Adjective	Verb	Adverb
gliding	Yes	No	No	No
sailplaning	Yes	No	No	No

As nouns, gliding and sailplaning are synonyms defined as:

Other synonyms of gliding include glide, sailing, soaring.

gliding (noun)	sailplaning (noun)
the activity of flying a glider	the activity of flying a glider