phrase structure vs sentence structure

phrase structure and sentence structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrase structure	Yes	No	No	No
sentence structure	Yes	No	No	No

As nouns, phrase structure and sentence structure are synonyms defined as:

phrase structure and sentence structure: the grammatical arrangement of words in sentences

Other synonyms of phrase structure include syntax.

phrase structure (noun)	sentence structure (noun)
the grammatical arrangement of words in sentences	the grammatical arrangement of words in sentences