monkey vs nestling

monkey and nestling both are nouns.

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

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

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

monkey (noun)	nestling (noun)
any of various long-tailed primates (excluding the prosimians)	young bird not yet fledged
one who is playfully mischievous	a young person of either sex

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