Final answer:
The part of speech that cannot be used as part of a noun phrase is the verb.
Step-by-step explanation:
The part of speech that cannot be used as part of a noun phrase is the verb.
A noun phrase is a group of words centered around a noun, which functions as the head of the phrase. It can include modifiers or determiners, such as adjectives or articles, and pronouns that replace or refer to nouns.
For example, in the noun phrase 'the big red apple', 'apple' is the noun, while 'the', 'big', and 'red' are the modifiers. If we replace 'apple' with a pronoun like 'it', the noun phrase becomes 'the big red it'.
Learn more about parts of speech