naval unit vs squadron

naval unit and squadron both are nouns.

Word	Noun	Adjective	Verb	Adverb
naval unit	Yes	No	No	No
squadron	Yes	No	No	No

As nouns, squadron is a hyponym of naval unit; that is, squadron is a word with a more specific, narrower meaning than naval unit:

naval unit: a military unit that is part of a navy
squadron: a naval unit that is detached from the fleet for a particular task

Other hyponyms of naval unit include division, naval division.

naval unit (noun)	squadron (noun)
a military unit that is part of a navy	an air force unit larger than a flight and smaller than a group
	a cavalry unit consisting of two or more troops and headquarters and supporting arms
	a naval unit that is detached from the fleet for a particular task