The term 'BOARD PARTNER' can be broken down into two crossword solutions: ROOM (4 letters) and BED (3 letters). A board partner is someone who shares a ROOM and BED with another person. This type of arrangement is often seen in college dorms, where two people share a ROOM and BED. It can also be seen in other living situations, such as when two people share an apartment or house. In any case, a board partner is someone who shares a living space with another person.