Grammatical category is a term used to describe the different ways in which words can be used in a sentence. It includes categories such as CASE, GENDER, and thirdperson. CASE is a four letter word that refers to the form of a noun or pronoun that indicates its relationship to other words in a sentence. GENDER is a six letter word that refers to the classification of nouns and pronouns according to whether they are masculine, feminine, or neuter. Thirdperson is an eleven letter word that refers to the use of pronouns to refer to someone or something other than the speaker or writer.