word structure vs morphology

word structure and morphology both are nouns.

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

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

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

Other synonyms of word structure include sound structure, syllable structure.

word structure (noun)	morphology (noun)
the admissible arrangement of sounds in words	the branch of biology that deals with the structure of animals and plants
	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