The term 'BOSTON NBAER' is a reference to the Boston Celtics, a professional basketball team in the National Basketball Association (NBA). The crossword solutions for this term are CELT (4 letters) and CELTIC (6 letters). CELT is an abbreviation of the word CELTIC, which is the name of the Boston Celtics. The Celtics are one of the most successful teams in the NBA, having won 17 championships since their founding in 1946.