monkey vs nipper

monkey and nipper both are nouns.

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

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

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

monkey (noun)	nipper (noun)
any of various long-tailed primates (excluding the prosimians)	a grasping structure on the limb of a crustacean or other arthropods
one who is playfully mischievous	a young person of either sex

monkey (verb)	nipper (verb)
do random, unplanned work or activities or spend time idly
play around with or alter or falsify, usually secretively or dishonestly