Incheon rhymes with:
inchon, inchon, inchon, absecon, acetosyringone, alteon, bergeron, calgon, crampon, decathlon, delaune, devaughn, doggone, einon, haton, inchon, jumbotron, kirwan, lieson, malathion, mouton, papon, ptyon, recon, rubicon, savion, savon, scaleatron, sephlon, styron, suon, teason
Incheon sounds like:
iannaccone, iannacone, imagine, imogen, imogene, inacom, inchon, incision, incom, income, ingenue, ingham, ingman, insane, insignia, insomnia