Etymon
pie-meh2ter-protogermanic-moder-protowest-germanic-moder-old-english-modor-middle-english-moder-english-mother-protoindoeuropean-pewg-protogermanic-fukkona-old-english-fuccian-middle-english-fukken-english-fuck-protoindoeuropean-yosder
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.