The term PLUM PART is composed of three words: STONE (5 letters), PIT (3 letters), and LEAD (4 letters). The first word, STONE, refers to a hard substance that is found in nature and is often used for building materials. The second word, PIT, is a hole or depression in the ground. The third word, LEAD, is a heavy metal that is toxic to humans and animals. Together, these three words form the term PLUM PART, which is a part of a fruit tree that contains the seed.