Nouns

(n)soprano, treblethe pitch range of the highest female voice

Verbs

(v)treblesing treble
(v)triple, trebleincrease threefold“Triple your income!”

Adjectives

(s)soprano, treblehaving or denoting a high range“soprano voice”, “soprano sax”, “the boy still had a fine treble voice”, “the treble clef”
(s)treble, threefold, three-fold, triplethree times as great or many“a claim for treble (or triple) damages”, “a threefold increase”
(s)ternary, treble, triple, triplexhaving three units or components or elements“a ternary operation”, “a treble row of red beads”, “overcrowding made triple sessions necessary”, “triple time has three beats per measure”, “triplex windows”
(s)double, dual, twofold, two-fold, treble, threefold, three-foldhaving more than one decidedly dissimilar aspects or qualities“a double (or dual) role for an actor”, “the office of a clergyman is twofold; public preaching and private influence” (R.W.Emerson), “every episode has its double and treble meaning” (Frederick Harrison)