"Red" on its own is not a phrase. A phrase is more like a sentence, or a group of words.
The word 'red' is a noun and an adjective; the name of a colour, and the colour of an object.
It's from the Red Badge of Courage and it is a metaphor.
The prepositional phrase in the sentence is "with red hair."
What kind of phrase is "If you save your money
adjective phrase
adverb phrase
adjective phrase
prepositional phrase.
Verb phrase
In the phrase, "Charging at the red cloak, the bull missed his mark," the participle phrase is "charging at the red cloak." It is a participle phrase because it works as an adjective in the sentence.
Adverb phrase
phrase. If a person or company is in the red or if their bank account is in the red, they have spent more money than they have in their account and therefore they owe money to the bank.
Adverb Phrase