Name the kinds of structure words?

words

• articles — the and a. In some inflected languages, the articles may take on the case of the declension of the following noun.
• pronouns — inflected in English, as he — him, she — her, etc.
• adpositions — uninflected in English
• conjunctions — uninflected in English
• auxiliary verbs — forming part of the conjugation (pattern of the tenses of main verbs), always inflected
• interjections — sometimes called "filled pauses", uninflected
• particles — convey the attitude of the speaker and are uninflected, as if, then, well, however, thus, etc.
• expletives — take the place of sentences, among other functions.
• pro-sentences — yes, okay, etc.