Pronouns are used to take the place or substitute for nouns to avoid repetition of the nouns for simplicity or clarity.
Verbs are used to show actions (walk, talk, see, go) or to describe a condition of existence or state of being (is happy, is tall). Verbs have many attributes such as person, number, voice, mood, and tense.
Prepositions are used to show the relationship of nouns or pronouns with other words in the sentence.
Nouns are words that name a person, place, thing, idea, or concept.
Interjections express strong emotion, like anger, excitement, or commitment. Many interjections are “sound” words that have no meaning in themselves other than just expressing an emotion. One example is “Yuck!”, which expresses a feeling of disgust.
Conjunctions join two or more words, phrases, or clauses. There are two types of conjunctions: coordinate and subordinate.
Adverbs are words that answer any of the questions where/when/why/how/to what degree. Adverbs modify verbs, adjectives, or other adverbs.
Adjectives answer any of the questions which/what kind of/how many. Adjectives modify nouns and are generally singular in form.