subordinating vs subordinative

subordinating and subordinative both are adjectives.

Word	Noun	Adjective	Verb	Adverb
subordinating	No	Yes	No	No
subordinative	No	Yes	No	No

As adjectives, subordinating and subordinative are synonyms defined as:

subordinating and subordinative: serving to connect a subordinate clause to a main clause

subordinating (adjective)	subordinative (adjective)
serving to connect a subordinate clause to a main clause	serving to connect a subordinate clause to a main clause