Cathmor rhymes with:
astronomer, bancomer, bessemer, beumer, bodamer, bodenhamer, burkhammer, chrismer, customer, derhammer, elastomer, goldammer, gossamer, grismer, isomer, jasmer, jesmer, kasmer, kennamer, latecomer, latimer, lattimer, machamer, merksamer, monomer, osmer, polymer, ruchlamer, schellhammer, shelhamer, tesmer, wasmer, wismer, ziesmer
Cathmor sounds like:
castner, cautionary, codner, costner, costumer, cotner, cotnoir, cudmore, customary, customer