[ noun ] a guest entertained in your house <noun.person>
houseguest \houseguest\, house guest \house guest\n. a guest entertained and staying overnight in one's house for one or more nights. [WordNet 1.5 +PJC]
A family "just trying to help people" began regrouping today from a fire that raced through their eight-bedroom house, killing six foster children and an elderly houseguest who had been homeless.
"Before I used to ride my bike over, give someone 2 cents and spend the afternoon with a houseguest," she said.