guest

ot noun

1. A recipient of hospitality, specifically someone staying by invitation at the house of another. The guests were let in by the butler.
2. A patron or customer in a hotel etc. Guests must vacate their rooms by 10 o'clock on their day of departure.
3. An invited visitor or performer to an institution or to a broadcast. The guest for the broadcast was a leading footballer.
4. A user given temporary access to a system despite not having an account of their own.

fe’l verb

1. To appear as a guest, especially on a broadcast
2. As a musician, to play as a guest, providing an instrument that a band/orchestra does not normally have in its line up (for instance, percussion in a string band)
3. To receive or entertain hospitably.