submersible vs apparatus

submersible and apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
submersible	Yes	Yes	No	No
apparatus	Yes	No	No	No

As nouns, apparatus is a hypernym of submersible; that is, apparatus is a word with a broader meaning than submersible:

Other hypernyms of submersible include setup.

submersible (noun)	apparatus (noun)
a warship designed to operate under water	equipment designed to serve a specific function
an apparatus intended for use under water	(anatomy) a group of body parts that work together to perform a given function

submersible (adjective)	apparatus (adjective)
capable of being immersed in water or functioning while submerged