Spectre rhymes with:
inspector, specter, spector, spektr, inspector, specter, spector, spektr, collector, connecter, connector, decter, defector, derecktor, detector, director, ector, erector, fechter, hector, injector, inspector, lecter, lector, nectar, objector, prechter, projector, protector, rector, reflector, schechter, schecter, schlechter, sector, specter, spector, spektr, transtector, vector, waechter, wechter
Spectre sounds like:
spectator, specter, specthrie, spector, spectra, spektr, subsidiary