speleologist vs spelaeologist

speleologist and spelaeologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
speleologist	Yes	No	No	No
spelaeologist	Yes	No	No	No

As nouns, speleologist and spelaeologist are synonyms defined as:

Other synonyms of speleologist include potholer, spelunker.

speleologist (noun)	spelaeologist (noun)
a person who explores caves	a person who explores caves