The term 'boisterous laugh' can be defined by the crossword solutions of GUFFAW (6 letters), CACKLE (6 letters), YUK (3 letters), ROAR (4 letters), and hawhaw (6 letters). A GUFFAW is a loud, hearty laugh, often accompanied by slapping one's knee. Cackling is a high-pitched, often maniacal laughter. YUK is an informal expression of laughter, usually used to express amusement or surprise. Roaring is a deep, loud laughter that often echoes. Lastly, hawhaw is a loud, braying laugh. All of these terms describe a boisterous laugh, which is a loud, unrestrained, and often contagious laughter.