Etymon
enm-spoilen-english-spoil-protoindoeuropean-penkwe-protogermanic-fimf-protowest-germanic-fimf-old-english-fif-middle-english-fyf-english-five-english-spoilfive-from-spoil-five
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.