 For example, the word "brother" in English-speaking societies indicates a son of the same parent; thus, English-speaking societies use the word "brother" as a descriptive term.A person's male first cousin could be the mother's brother's son, mother's sister's son, father's brother's son, father's sister's son, and so on; English-speaking societies therefore use the word "cousin" as a classificatory term.Morgan discovered that a descriptive term in one society can become a classificatory term in another society.