two-fold vs treble

two-fold is not a noun while treble is a noun.

Word	Noun	Adjective	Verb	Adverb
two-fold	No	Yes	No	No
treble	Yes	Yes	Yes	No

As adjectives, two-fold and treble are synonyms defined as:

two-fold and treble: having more than one decidedly dissimilar aspects or qualities

Other synonyms of two-fold include double, dual, three-fold, threefold, twofold.

two-fold (noun)	treble (noun)
	the pitch range of the highest female voice

two-fold (adjective)	treble (adjective)
twice as great or many	having or denoting a high range
having more than one decidedly dissimilar aspects or qualities	three times as great or many
	having three units or components or elements
	having more than one decidedly dissimilar aspects or qualities

two-fold (verb)	treble (verb)
	increase threefold
	sing treble