subordinate conjunction vs subordinating conjunction

subordinate conjunction and subordinating conjunction both are nouns.

Word	Noun	Adjective	Verb	Adverb
subordinate conjunction	Yes	No	No	No
subordinating conjunction	Yes	No	No	No

As nouns, subordinate conjunction and subordinating conjunction are synonyms defined as:

subordinate conjunction and subordinating conjunction: a conjunction (like `since' or `that' or `who') that introduces a dependent clause

subordinate conjunction (noun)	subordinating conjunction (noun)
a conjunction (like `since' or `that' or `who') that introduces a dependent clause	a conjunction (like `since' or `that' or `who') that introduces a dependent clause
	the subordination that occurs when a conjunction makes one linguistic unit a constituent of another