gun emplacement vs nest

gun emplacement and nest both are nouns.

Word	Noun	Adjective	Verb	Adverb
gun emplacement	Yes	No	No	No
nest	Yes	No	Yes	No

As nouns, nest is a hyponym of gun emplacement; that is, nest is a word with a more specific, narrower meaning than gun emplacement:

Other hyponyms of gun emplacement include pillbox.

gun emplacement (noun)	nest (noun)
an emplacement for a gun	a kind of gun emplacement
	furniture pieces made to fit close together
	a gang of people (criminals or spies or terrorists) assembled in one locality
	a cosy or secluded retreat
	a structure in which animals lay eggs or give birth to their young

gun emplacement (verb)	nest (verb)
	fit together or fit inside
	gather nests
	move or arrange oneself in a comfortable and cozy position
	inhabit a nest, usually after building