lodger
Word family
Synonym discussion
Sense: noun/1
Lodger usually describes someone who rents a room in the same home as the owner. Boarder is close, but it more strongly suggests that meals are included. Roomer is similar in meaning, yet it sounds more American and often focuses only on the rented room. Tenant is the broad legal word for anyone paying rent, especially for a whole flat or house, so it is less specific than lodger. Roommate is different again: a roommate shares the living space as another resident, not as someone paying the owner for a room. If Mei rents out her spare bedroom and still lives there, lodger is the clearest choice.
Common collocations
Etymology
Lodger is built from lodge, a word that came into English through French and referred to staying somewhere temporarily. English added the ending -er to name the person who stays there, especially someone paying to live in another person's home.