append

appendage

appendages

appendant

appendants

appendectomies

appendectomy

appended

appendicectomy

appendices

appendicitis

appendicitises

appendicular

appending

appendix

appendixes

appends

happen

happenchance

happenchances

happened

happening

happenings

happens

happenstance

happenstances

nonhappening

nonhappenings

rappen

unhappen

unhappened

unhappening

unhappens

wappenschawing

wappenschawings