4 letters:
nail, nale

5 letters:
ailor, ayler, aylor, caler, eyler, faler, galer, kaler, maler, naber, nader, nadir, nager, naill, nails, namer, naser, nazer, neher, neyer

6 letters:
bailer, bailor, baylor, caylor, failor, gayler, gaylor, jailer, kaylor, mailer, nagler, nailed, nature, neller, noller, paylor, sailer, sailor, sayler, saylor, seyler, shaler, tailor, tayler, taylor, thaler, whaler, naylor

7 letters:
kneller, seyller

8 letters:
neighbor