syllable structure vs sound structure

syllable structure and sound structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
syllable structure	Yes	No	No	No
sound structure	Yes	No	No	No

As nouns, syllable structure and sound structure are synonyms defined as:

syllable structure and sound structure: the admissible arrangement of sounds in words

Other synonyms of syllable structure include morphology, word structure.

syllable structure (noun)	sound structure (noun)
the admissible arrangement of sounds in words	the admissible arrangement of sounds in words