Firewall rhymes with:
agarwal, agarwal, caterwaul, agarwal, aircal, algol, berdahl, bergdahl, bergendahl, biocontrol, castrol, caterwaul, clairol, consol, ebersol, engdahl, erdahl, ethyol, ewbal, felbatol, filtrol, jaspal, jordahl, kcal, kufahl, laventhol, liljedahl, lubrizol, malval, naral, nordahl, o'driscoll, odriscoll, offerdahl, oftedahl, opsahl, pentothal, phenol, photocall, pofahl, pufahl, ransall, repsol, ringdahl, sandall, scurdall, snowfall, stordahl, stovall, sturdhal, topol, tricentrol, vertol, vorpahl
Firewall sounds like:
fairall, fairley, fairlie, fairlow, fairly, farewell, fariello, farlee, farley, farlow, farly, farrel, farrell, farrelly, farwell, feral, ferol, ferraioli, ferrall, ferrel, ferrell, ferrelli, ferrill, ferullo, fibrile, fiorella, fiorelli, fiorello, fiorillo, frail, frailey, fraioli, fraley, frawley, freel, freely, frel, friel, fril, friley, frill, frilly, frolo, furlow