Most adjectives, and a fair number of nouns, inflect for gender. This usually follows a regular pattern of endings. The two main patterns are generally referred to as "four-form" and "two-form" adjectives. Four-form adjectives have distinct masculine and feminine forms, whereas two-form adjectives have the same form for both masculine and feminine. They are derived from the Latin first/second, and the third declension respectively. Many nouns follow the four-form inflection, but some may follow the two-form inflection. Some are irregular in some way.