battle vs naval battle

battle and naval battle both are nouns.

Word	Noun	Adjective	Verb	Adverb
battle	Yes	No	Yes	No
naval battle	Yes	No	No	No

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

battle: a hostile meeting of opposing military forces in the course of a war
naval battle: a pitched battle between naval fleets

Other hyponyms of battle include Armageddon, pitched battle, armed combat, combat, dogfight, assault.

battle (noun)	naval battle (noun)
a hostile meeting of opposing military forces in the course of a war	a pitched battle between naval fleets
an energetic attempt to achieve something
an open clash between two opposing groups (or individuals)

battle (verb)	naval battle (verb)
battle or contend against in or as if in a battle