Simpson's rhymes with:
simpsons, simpsons', simpsons, simpsons', simpsons, simpsons', thompson's, thompsons, jepson's, simpsons, simpsons', thompson's, thompsons
Simpson's sounds like:
significance, simpkins, simpsons, simpsons', symposiums
simpsons, simpsons', simpsons, simpsons', simpsons, simpsons', thompson's, thompsons, jepson's, simpsons, simpsons', thompson's, thompsons
significance, simpkins, simpsons, simpsons', symposiums