pursual vs trailing

pursual and trailing both are nouns.

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

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

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

Other hyponyms of pursual include tracking, shadowing, tailing, stalk, stalking.

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