What is a group of words not containing verb or subject?

A group of words not containing a verb or subject is called a phrase.

Here are some examples of phrases:

* Noun phrases: "the big red ball", "my best friend", "the city of London"

* Prepositional phrases: "in the garden", "on the table", "with a smile"

* Adjective phrases: "very happy", "extremely tired", "quite beautiful"

* Adverb phrases: "very quickly", "with great care", "in a hurry"

Important Note: While phrases lack a verb and subject, they can often be used within sentences to modify other words or add context.