Words are categorized according to eight parts of speech, which explain a word's purpose or usage.
Nouns and proper nouns
Example: ⇒ brother, sister, city, school, house, soccer ball, football stadium, George, happiness, library.
Verbs
Example: ⇒ go, work, be is seem, appear, know.
Adjectives
Example: ⇒ happy, tired, green, yellow, colorful, five.
Adverbs
Example: ⇒ quickly, slowly, late, very, happily.
Hope this helps you!
Have a nice day! :)