Etymon
enm-ficcioun-english-fiction-protoindoeuropean-kos-protogermanic-gaz-protowest-germanic-g-old-english-ig-middle-english-y-english-y-english-fictiony-from-fiction-y
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.