submergible vs submersible

submergible is not a noun while submersible is a noun.

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

As adjectives, submergible and submersible are synonyms defined as:

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

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

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