Lodger
/ˈlɑːdʒər/
Definition 1 of 2
Pro Tip 1/3Shared Spaces
A lodger often shares common areas like the kitchen and living room with the homeowner. 
As a lodger, Mark has his own bedroom but shares the kitchen with the Jones family.
Pro Tip 2/3Long-Term Arrangement
A lodger usually stays for a longer duration, often with a formal agreement. 
Emma signed a six-month contract to be a lodger at the Thompsons'.
Pro Tip 3/3Not Just Rent
A lodger may also contribute to utility bills or household chores. 
The lodger agreed to take care of the lawn as part of his living arrangement.