Previous solution:
are, ares, ear, ears, era, eras, ers, far, fare, fares, fear, fears, frae, rase, ref, refs, safe, safer, sea, sear, sera, serf
are, ares, ear, ears, era, eras, ers, far, fare, fares, fear, fears, frae, rase, ref, refs, safe, safer, sea, sear, sera, serf