spelaeology vs pursuit

spelaeology and pursuit both are nouns.

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

As nouns, pursuit is a hypernym of spelaeology; that is, pursuit is a word with a broader meaning than spelaeology:

Other hypernyms of spelaeology include avocation, by-line, hobby, sideline, spare-time activity.

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