Client
Part of speech: noun
Definition: A customer a buyer or receiver of goods or services. The role of a computer application or system that requests and/or consumes the services provided by another having the role of server. Person who receives help or advice from a professional person (ex. a lawyer, an accountant, a social worker, a psychiatrist, etc).
Example sentence: When we meet, I'm interested and I'm curious about what he's doing because he's burning a number from a client. And I'm like, 'Who is this?' and my girlfriend's like, 'That's a drug dealer. Stay away from him.'
Guest
Part of speech: noun
Definition: a recipient of hospitality, specifically someone staying by invitation at the house of anothera patron or customer in a hotel etc.an invited visitor or performer to an institution or to a broadcast
Part of speech: verb
Definition: to appear as a guest, especially on a broadcastas a musician, to play as a guest, providing an instrument that a band/orchestra does not normally have in it's line up (for instance, percussion in a string band
Example sentence: The first day one is a guest, the second a burden, and the third a pest.