morphology vs word structure

morphology and word structure both are nouns.

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

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

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

Other synonyms of morphology include sound structure, syllable structure.

morphology (noun)	word structure (noun)
the branch of biology that deals with the structure of animals and plants	the admissible arrangement of sounds in words
studies of the rules for forming admissible words
the admissible arrangement of sounds in words
the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms