There are many words in English that have forms of nouns, verbs, adjectives and adverbs. For example; beauty (noun), beautify (verb), beautiful (adjective), beautifully (adverb). It is very useful to learn as many of these common words used in academic writing in their noun/verb/adjective/adverb forms. However, there are also some words that do not always have all 4 forms.
You can also check your answers to these activities using the answer key here.