mine vs marine mine

mine and marine mine both are nouns.

Word	Noun	Adjective	Verb	Adverb
mine	Yes	No	Yes	No
marine mine	Yes	No	No	No

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

mine: explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel
marine mine: an explosive mine designed to destroy ships that bump into it

Other hyponyms of mine include floating mine, booby trap, ground-emplaced mine, land mine.

mine (noun)	marine mine (noun)
explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel	an explosive mine designed to destroy ships that bump into it
excavation in the earth from which ores and minerals are extracted

mine (verb)	marine mine (verb)
lay mines
get from the earth by excavation