submersible vs submergible

submersible is a noun but submergible is not a noun.

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

As adjectives, submersible and submergible are synonyms defined as:

submersible and submergible: capable of being immersed in water or functioning while submerged

submersible (noun)	submergible (noun)
a warship designed to operate under water
an apparatus intended for use under water

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