military force vs military unit

military force and military unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
military force	Yes	No	No	No
military unit	Yes	No	No	No

As nouns, military force and military unit are synonyms defined as:

military force and military unit: a unit that is part of some military service

Other synonyms of military force include force, military group.

military force (noun)	military unit (noun)
a unit that is part of some military service	a unit that is part of some military service