X. rhymes with:
aix, atx, beck's, becks, blech's, caltex, 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. sounds like:
x, x's, x.'s, x.s, xhosa, xi, xiao, xie, xio, xu, xue, xus