Longing rhymes with:
belonging, prolonging, belonging, prolonging, banging, belonging, bringing, clanging, clinging, flinging, ganging, hanging, haranguing, mudslinging, overhanging, pinging, prolonging, ringing, singing, slinging, springing, stinging, stringing, swinging, upbringing, winging, wringing
Longing sounds like:
lancing, langhans, languishing, lankans, lansing, lansing's, launching, launchings, lawmaking, leingang, lensing, limousines, linking, longings, lounging, luminescence, luncheons, lunching, lunging, lynching, lynchings