sergeant major vs command sergeant major

sergeant major and command sergeant major both are nouns.

Word	Noun	Adjective	Verb	Adverb
sergeant major	Yes	No	No	No
command sergeant major	Yes	No	No	No

As nouns, sergeant major and command sergeant major are synonyms defined as:

sergeant major and command sergeant major: a noncommissioned officer serving as chief administrative officer of a headquarters unit of the Army

sergeant major (noun)	command sergeant major (noun)
large blue-grey black-striped damselfish; nearly worldwide	a noncommissioned officer serving as chief administrative officer of a headquarters unit of the Army
a noncommissioned officer serving as chief administrative officer of a headquarters unit of the Army