attache case vs attache

attache case and attache both are nouns.

Word	Noun	Adjective	Verb	Adverb
attache case	Yes	No	No	No
attache	Yes	No	No	No

As nouns, attache case and attache are synonyms defined as:

attache case (noun)	attache (noun)
a shallow and rectangular briefcase	a shallow and rectangular briefcase
	a specialist assigned to the staff of a diplomatic mission