Indigo rhymes with:
archipelago, genego, papago, amigo, archipelago, bargo, belgo, bongo, cargo, chicago, fandango, fargo, genego, gogo, hidalgo, lumbago, outgo, papago, pogo, seago, sego, shawgo, vertigo, vidigo, wargo
Indigo sounds like:
imitates, immediacy, immunetech, immunities, immunomedic, immunomedics, inadequacies, inadequacy, index, index's, indexes, india's, indic, indica, indices, indicia, indies, indosuez, induce, induces, indus, indyk, initiates, inmate's, inmates, innuendoes, innuendos, intake, intex, intis, intuit's