BOSC is a type of PEAR, specifically a variety of the European PEAR. It is an elongated fruit with a brownish-yellow skin and a sweet, juicy flesh. The PEAR solution to the crossword is a four-letter word for this type of PEAR. PEARS is a five-letter word for the plural form of the same fruit. ANJOU is also a five-letter word for a variety of European PEAR, which is rounder and slightly smaller than the BOSC variety.