head over heels vs in great confusion

head over heels and in great confusion both are adverbs.

Word	Noun	Adjective	Verb	Adverb
head over heels	No	No	No	Yes
in great confusion	No	No	No	Yes

As adverbs, head over heels and in great confusion are synonyms defined as:

Other synonyms of head over heels include heels over head, topsy-turvily, topsy-turvy.

head over heels (adverb)	in great confusion (adverb)
in disorderly haste	in disorderly haste