marine vs seagoing

marine is a noun but seagoing is not a noun.

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

marine (noun)	seagoing (noun)
a soldier who serves both on shipboard and on land

marine (adjective)	seagoing (adjective)
relating to or characteristic of or occurring on or in the sea	used on the high seas
of or relating to the sea
of or relating to military personnel who serve both on land and at sea (specifically the U.S. Marine Corps)
relating to or involving ships or shipping or navigation or seamen
native to or inhabiting the sea