Belabor rhymes with:
klaiber, laber, labor, aber, aybar, baber, faber, fabre, gaber, graber, haber, jaber, klaiber, laber, labor, lefeber, lefebre, lefebvre, lesabre, naber, neighbor, raber, saber, sabir, sabre, schaber, shaber, taber, tabor, traber
Belabor sounds like:
balfour, belfer, belfiore, belfry, believer, belvoir, bilbrey, bilbro, blooper, blubber, blueberry, bluffer, bolivar