unsubstantive

As a noun terms

is .

As an adjective unsubstantive is

(grammar) not having the form of a noun.

As adjectives the difference between unsubstantive and insubstantive

is that unsubstantive is not having the form of a noun while insubstantive is not substantive (in any sense.

As a noun substance

is physical matter; material.

As an adjective unsubstantive is

(grammar) not having the form of a noun.

As a noun noun

is a name of a thing. Either a noun substantive, which can stand alone and does not require another word to be joined with it to show its signification, or a noun adjective, which can not stand by itself, but requires to be joined with some other word, in order to make sense.

As a verb noun

is to convert a word to a noun.

As an adjective unsubstantive is

not having the form of a noun.