Deltaic rhymes with:
altaic, photovoltaic, altaic, photovoltaic, algebraic, altaic, archaic, deoxyribonucleic, formulaic, hayek, mosaic, nucleic, passaic, photovoltaic, prosaic, ptolemaic, ribonucleic
Deltaic sounds like:
delduca, deletes, deloatch, delta's, deltak, deltas, deltec, deludes, dilts, diltz, dilutes