Etymon
pie-ne-protoindoeuropean-n-protogermanic-un-protowest-germanic-un-old-english-un-middle-english-un-english-un-protoindoeuropean-h1egh-protoindoeuropean-s-protoindoeuropean-h1eghs-protoitalic-eks-latin-ex-latin-ef-protoindoeuropean-dheh1-protoindoeuropean-dheh1k-protoindoeuropean-yeti-protoindoeuropean-dhh1kyeti-protoitalic-akjo-protoitalic-fakjo-latin-facio-latin-efficio-protoindoeuropean-wos-protoindoeuropean-ihwosder
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.