Final answer:
A phrase is a group of words missing either a subject or a verb, while a clause is a group of words containing both a subject and a verb.
Step-by-step explanation:
A phrase is a group of words that functions as a unit within a sentence, but is missing either a subject or a verb. Examples of phrases include noun phrases, adjective phrases, and adverb phrases. For example, in the sentence 'The big blue car drove slowly to the store,' 'the big blue car' is a noun phrase, 'blue' is an adjective phrase, and 'slowly to the store' is an adverb phrase.
A clause, on the other hand, is a group of words that contains both a subject and a verb. It can be either an independent clause, which can stand alone as a sentence, or a dependent clause, which depends on another clause to make sense. For example, in the sentence 'I went to the store because I needed groceries,' 'I went to the store' is an independent clause and 'because I needed groceries' is a dependent clause.