yearling vs nipper

yearling and nipper both are nouns.

Word	Noun	Adjective	Verb	Adverb
yearling	Yes	No	No	No
nipper	Yes	No	No	No

As nouns, nipper is a hypernym of yearling; that is, nipper is a word with a broader meaning than yearling:

Other hypernyms of yearling include child, fry, kid, minor, nestling, shaver, small fry, tiddler, tike, tyke, youngster.

yearling (noun)	nipper (noun)
an animal in its second year	a grasping structure on the limb of a crustacean or other arthropods
a racehorse considered one year old until the second Jan. 1 following its birth	a young person of either sex
a young child who is just beginning to walk