Cistern rhymes with:
best-western, eastern, mideastern, midwestern, morganstern, morgenstern, northeastern, northwestern, southeastern, southwestern, transwestern, western
Cistern sounds like:
cadrone, castorena, caterino, catharine, catherina, catherine, catherman, catron, cauthorn, cawthorn, cawthorne, cdrom, cedrone, chadron, chesterman, citrano, citrin, citrine, citroen, citron, cothern, cothran, cothren, cothron, cotrone, cotroneo, cotterman, cutrona, cutrone, cutworm, cydrome