commutable vs convertible

commutable is not a noun while convertible is a noun.

Word	Noun	Adjective	Verb	Adverb
commutable	No	Yes	No	No
convertible	Yes	Yes	No	No

commutable (noun)	convertible (noun)
	a car that has top that can be folded or removed
	a sofa that can be converted into a bed
	a corporate security (usually bonds or preferred stock) that can be exchanged for another form of security (usually common stock)

commutable (adjective)	convertible (adjective)
subject to alteration or change	capable of being exchanged for or replaced by something of equal value
capable of being exchanged for another or for something else that is equivalent	designed to be changed from one use or form to another
	capable of being changed in substance as if by alchemy