navy vs naval forces

navy and naval forces both are nouns.

Word	Noun	Adjective	Verb	Adverb
navy	Yes	No	No	No
naval forces	Yes	No	No	No

As nouns, navy and naval forces are synonyms defined as:

navy and naval forces: an organization of military vessels belonging to a country and available for sea warfare

navy (noun)	naval forces (noun)
a dark shade of blue	an organization of military vessels belonging to a country and available for sea warfare
an organization of military vessels belonging to a country and available for sea warfare