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guest

guest /ˈgɛst/ noun
plural guests
guest
/ˈgɛst/
noun
plural guests
Britannica Dictionary definition of GUEST
[count]
: a person who is invited to visit or stay in someone's home
: a person who is invited to a place or an event as a special honor
: a customer at a hotel, restaurant, etc.
: a usually well-known person who is invited to appear or perform on a program, at an event, etc.
often used before another noun

be my guest

used in speech to say that someone is welcome to do or take something