Hello
A noun clause is a group of words that contains a noun or pronoun and a verb but is an incomplete thought that can't stand on it's own. A noun clause can perform the function of a noun as the subject of a sentence and the object of a verb or a preposition. Examples:
My car is the one parked opposite the bank.
What you want is the best quality that you can afford.
A noun phrase is any word or group of words based on a noun or pronoun (without a verb) that can function in a sentence as a subject, object of a verb or a prepositional. A noun phrase can be one word or many words. Examples:
She is hard-working.
The board meeting is at two.
I brought my notes from the meeting.
Hope this clarifies the difference.
Regards
Workplace English Expert