marine engineer vs technologist

marine engineer and technologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
marine engineer	Yes	No	No	No
technologist	Yes	No	No	No

As nouns, technologist is a hypernym of marine engineer; that is, technologist is a word with a broader meaning than marine engineer:

marine engineer: a naval officer responsible for the operation and maintenance of the ship's engines
technologist: a person who uses scientific knowledge to solve practical problems

Other hypernyms of marine engineer include applied scientist, engineer.

marine engineer (noun)	technologist (noun)
a naval officer responsible for the operation and maintenance of the ship's engines	a person who uses scientific knowledge to solve practical problems