Returnees rhymes with:
internees, internees, balinese, cantonese, chinese, designees, detainees, indochinese, internees, japanese, javanese, knees, mcnease, mcnees, menees, neas, nease, nees, neese, neis, niese, nominee's, nominees, pawnees, resignees, sinise, sneeze, sudanese, taiwanese, trainees, unease
Returnees sounds like:
red-herring, red-herrings, redrawing, reordering, retiring, retraining, retrench, retrying, returning, returns, returns'