sublieutenant vs lieutenant

sublieutenant and lieutenant both are nouns.

Word	Noun	Adjective	Verb	Adverb
sublieutenant	Yes	No	No	No
lieutenant	Yes	No	No	No

As nouns, lieutenant is a hypernym of sublieutenant; that is, lieutenant is a word with a broader meaning than sublieutenant:

sublieutenant (noun)	lieutenant (noun)
an officer ranking next below a lieutenant	an officer in a police force
	a commissioned military officer
	an assistant with power to act when his superior is absent
	an officer holding a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant commander and above lieutenant junior grade