We don't have synonyms for touchtone yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are touchstone, touch tone and touch-tone.
(adj) :
Alternative form of touch-tone. [Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.]
(n) :
Alternative form of touch-tone. [A telephone with buttons that produce tones, one for each digit.]
(adj) :
Alternative form of touch-tone. [Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.]
(n) :
Alternative form of touch-tone. [A telephone with buttons that produce tones, one for each digit.]