GUEST

noun

1. A recipient of hospitality, specifically someone staying by invitation at the house of another.
2. A patron or customer in a hotel etc.
3. An invited visitor or performer to an institution or to a broadcast.

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.