(3) Can a word be a noun and also be another part of speech?
Yes! Many English words are both nouns and verbs. That is why it is important to consider the way the word is used in a particular sentence. Think about the word water and the way it is used in these two sentences. Other English words are nouns and adjectives, as in Less commonly other words are both nouns and other parts of speech, for example, prepositions, as in