trailing vs pursuit

trailing and pursuit both are nouns.

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

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

trailing: the pursuit (of a person or animal) by following tracks or marks they left behind
pursuit: the act of pursuing in an effort to overtake or capture

Other hypernyms of trailing include chase, following, pursual.

trailing (noun)	pursuit (noun)
the pursuit (of a person or animal) by following tracks or marks they left behind	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