The term 'nut-bearing tree' refers to trees that produce edible nuts. HAZEL (5 letters) is a type of nut-bearing tree that produces hazelnuts, which are small, round nuts with a thin, brown shell. BEECH (5 letters) is another type of nut-bearing tree that produces beechnuts, which are small, triangular nuts with a hard, spiky shell. Kola (4 letters) is a nut-bearing tree that produces kola nuts, which are large, round nuts with a hard, brown shell. Macadamia (9 letters) is a nut-bearing tree that produces macadamia nuts, which are small, oval-shaped nuts with a hard, smooth shell. Cola (4 letters) is a nut-bearing tree that produces cola nuts, which are large, round nuts with a hard, brown shell.