| Activity | One question and everything that came back from it — the link, the QR code, the cloud and every answer. |
| Session | The same thing, seen from the server's side. The identifier in the join link is the session id. |
| Response | One pupil's answer. A pupil has at most one response, however many times they send. |
| Word | One entry in the cloud. A response set to several words produces several. |
| .schoolWords file | A School Words activity saved to disk, including the question, the link and every answer. |
| SVG | A picture format that stays sharp at any size. What Save the picture produces. |
| The registry | The central list of who may use School Words at all, managed by an administrator. |
| Access rules | The per-activity list, set with the Access tool, of who may answer this particular question. |
| Administrator | Somebody who can add and remove addresses and domains in the registry. Being one is set per app — being an administrator elsewhere does not make you one here. |