Practice Makes Perfect: Spanish Pronouns and Prepositions, Premium 3rd Edition (2016)
Appendix A. The eight parts of speech
1. Noun
A word that represents a person, place, thing, or idea.
2. Verb
A word that expresses an action, occurrence, or mode of being.
3. Adjective
A word that modifies or describes a noun. It can be descriptive or quantitative.
NOTE Articles are classified as definite and indefinite. Technically, articles are adjectives, because they modify nouns; however, many people believe that they deserve separate status due to their frequency of use.
4. Adverb
A word that modifies or describes a verb, adjective, or other adverb.
5. Preposition
A word that shows the relationship of a noun or pronoun to another word in a phrase, clause, or sentence.
6. Interjection
A word or phrase used as an exclamation without any grammatical function.
7. Pronoun
A word that replaces a noun that is understood because of previous use or from context.
8. Conjunction
A word that connects two words, phrases, clauses, or sentences.