pursuit vs speleology

pursuit and speleology both are nouns.

Word	Noun	Adjective	Verb	Adverb
pursuit	Yes	No	No	No
speleology	Yes	No	No	No

As nouns, speleology is a hyponym of pursuit; that is, speleology is a word with a more specific, narrower meaning than pursuit:

Other hyponyms of pursuit include spelaeology, pigeon keeping.

pursuit (noun)	speleology (noun)
the act of pursuing in an effort to overtake or capture	the pastime of exploring caves
a diversion that occupies one's time and thoughts (usually pleasantly)	the scientific study of caves
an auxiliary activity
a search for an alternative that meets cognitive criteria