young person vs pup

young person and pup both are nouns.

Word	Noun	Adjective	Verb	Adverb
young person	Yes	No	No	No
pup	Yes	No	Yes	No

As nouns, pup is a hyponym of young person; that is, pup is a word with a more specific, narrower meaning than young person:

Other hyponyms of young person include blade, hobbledehoy, puppy, pupil, school-age child, schoolchild, slip.

young person (noun)	pup (noun)
a young person (especially a young man or boy)	young of any of various canines such as a dog or wolf
	an inexperienced young person

young person (verb)	pup (verb)
	give birth to (a puppy)