Caltex rhymes with:
wall-tex, tech's, techs, teck's, tex, wall-tex, aix, atx, beck's, becks, blech's, checks, cmx, convex, czechs, dec's, decks, dex, eckes, ex, execs, fedex, flecks, flex, govpx, heck's, hex, jex, lex, meckes, megaplex, mex, necks, nex, nobec's, onex, peck's, perplex, plex, quebec's, rex, sex, sheck's, shek's, specks, specs, tech's, techs, teck's, tex, treks, triplex, vex, wall-tex, wrecks, x, x.
Caltex sounds like:
calutzi, caseloads, casualties, causalities, celtic, celtics, celtics', celts, chalets, child's, childhoods, childish, childs, chocolates, ciliates, claddagh, claudius, cleats, clites, clothes, cloths, clots, clouds, clowdus, clutch, clutches, clutts, colds, colledge, collides, colt's, coltec, colts, coolidge, coolidge's, coultas, cult's, cultic, cults, cul_de_sac, cyclades