The Boston NBAers are a professional basketball team based in Boston, Massachusetts. The team is also known as the Boston Celtics, which is a five-letter word that is one of the solutions to the crossword. The Boston Celtics are one of the most successful franchises in the NBA, having won 17 championships since their founding in 1946. They are also one of the oldest teams in the league, having been in existence for over 70 years.