syllable structure vs word structure

syllable structure and word structure both are nouns.

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

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

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

Other synonyms of syllable structure include morphology, sound structure.

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