It is a noun phrase because it is composed of a noun and a modifier. The modifier can either come before or after the noun. In this case, it came before the noun. If a modifier comes before the noun, it can either be an article, possessive nouns, possessive pronouns, adjectives, or participles. In this case, the modifier is an adjective.
Noun - dog Modifier - the sick : it is an adjective that distinguishes the dog from other dogs.
Rhythm can be described as the beat and pace of a poem. Rhythm is created by the pattern of stressed and unstressed syllables in a line or verse. Rhythm can help to strengthen the meaning of words and ideas in a poem.
