Software
Website or web application
A website explains. An application is where ongoing work happens.
A website helps someone understand an organisation and take a first step. A web application is software they return to: submit a report, manage a booking, review a queue, update a record.
Many organisations need both, and they should share data. The public church site and the leadership dashboard are one platform. The discovery site and the structured inventory behind it are one product.
Calling everything a website hides the operational work. If staff will live in it every week, scope it as a system: roles, states, exports, and what happens when someone makes a mistake.
Part of Business software.