Tighter rhymes with:
beiter, biter, brighter, deiter, ex-fighter, fighter, kreiter, leiter, lighter, lyter, miter, nighter, overnighter, pitre, reiter, reitter, righter, riter, schneiter, schreiter, seiter, seitter, sluyter, slyter, whiter, writer, zeiter
Tighter sounds like:
taster, tastier, teaster, tessitore, tester, testor, testuro, texstar, texter, textor, texture, thaxter, toaster, together, toystore, tschetter, twister