Untie rhymes with:
altai, private-eye, pty, sty, switaj, tai, thai, tie, ty, tye
Untie sounds like:
uinta, unaided, unamended, unanimity, unaudited, und, undated, undid, undo, undue, unedited, unheeded, unimate, unimedia, uninitiated, unit, unita, unite, united, unity, unmade, unmanned, unmet, unnamed, unneeded, unted, untidy, untied, untiedt, unto, unwanted, unwed, unwind, unwound