spare-time activity vs pursuit

spare-time activity and pursuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
spare-time activity	Yes	No	No	No
pursuit	Yes	No	No	No

As nouns, spare-time activity and pursuit are synonyms defined as:

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

As nouns, pursuit is a hypernym of spare-time activity; that is, pursuit is a word with a broader meaning than spare-time activity:

spare-time activity: an auxiliary activity
pursuit: a diversion that occupies one's time and thoughts (usually pleasantly)

Other hypernyms of spare-time activity include interest, pastime.

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