| Subject | English | German |
| tech. | cathode-fay tube with synchronized rotating range sweep | Kathodenstrahlroehre mit synchronumlaufender Zeitachse |
| met. | fay alite | Fayalit |
| fish.farm. | fay dog | Kleingefleckter Katzenhai (Scyliorhinus canicula) |
| fish.farm. | fay dog | Kleiner Katzenhai (Scyliorhinus canicula) |