complex sentence vs subordinate clause

complex sentence and subordinate clause both are nouns.

Word	Noun	Adjective	Verb	Adverb
complex sentence	Yes	No	No	No
subordinate clause	Yes	No	No	No

complex sentence (noun)	subordinate clause (noun)
a sentence composed of at least one main clause and one subordinate clause	a clause in a complex sentence that cannot stand alone as a complete sentence and that functions within the sentence as a noun or adjective or adverb