unit vs squad

unit and squad both are nouns.

Word	Noun	Adjective	Verb	Adverb
unit	Yes	No	No	No
squad	Yes	No	No	No

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

unit (noun)	squad (noun)
an assemblage of parts that is regarded as a single entity	a cooperative unit (especially in sports)
a single undivided whole	a smallest army unit
an organization regarded as part of a larger social group	a small squad of policemen trained to deal with a particular kind of crime
a single undivided natural thing occurring in the composition of something else
any division of quantity accepted as a standard of measurement or exchange
an individual or group or structure or other entity regarded as a structural or functional constituent of a whole