Etymon
gem-arijaz-protowest-germanic-ari-old-english-ere-middle-english-ere-english-er-english-producer-protoindoeuropean-ke-protoindoeuropean-kom-protoitalic-kom-protoitalic-kom-latin-con-protoindoeuropean-upo-protoitalic-supo-latin-sub-latin-sub-protoindoeuropean-h1emder
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.