squadron vs naval unit

squadron and naval unit both are nouns.

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

As nouns, naval unit is a hypernym of squadron; that is, naval unit is a word with a broader meaning than squadron:

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

squadron (noun)	naval unit (noun)
an air force unit larger than a flight and smaller than a group	a military unit that is part of a navy
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