A noun phrase is two or more words that act as a noun. An expanded noun phrase can help to describe and give complicated information clearly.
eg: Seed is a noun. Tiny seed is a noun phrase.
The ball that bounced over the fence is over there is an expanded noun phrase.
An adverbial phrase is built round an adverb by adding words before and/or after it.
eg: The bird ate the apple as fast as possible.
The cat crept very slowly.