spelaeologist vs speleologist

spelaeologist and speleologist both are nouns.

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

As nouns, spelaeologist and speleologist are synonyms defined as:

Other synonyms of spelaeologist include potholer, spelunker.

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