attache vs specialist

attache and specialist both are nouns.

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

As nouns, specialist is a hypernym of attache; that is, specialist is a word with a broader meaning than attache:

attache: a specialist assigned to the staff of a diplomatic mission
specialist: an expert who is devoted to one occupation or branch of learning

Other hypernyms of attache include specialiser, specializer.

attache (noun)	specialist (noun)
a shallow and rectangular briefcase	an expert who is devoted to one occupation or branch of learning
a specialist assigned to the staff of a diplomatic mission	practices one branch of medicine