Ihnen rhymes with:
chinen, dinan, drinnon, finan, finnan, jokinen, kinnan, linen, linnane, mackinnon, mckinnon, ninon, quinon, tinnon
Ihnen sounds like:
i'm, iain, ian, ianni, iannone, im, imai, imam, iman, imm, immu, immune, immuno, imo, in, in., ina, inane, inhuman, inhumane, inman, inmon, inn, inno, inoue, inouye, iny, ion, iona, ione, iowan, iwan, iwen