ecclesiastical attire vs ecclesiastical robe

ecclesiastical attire and ecclesiastical robe both are nouns.

Word	Noun	Adjective	Verb	Adverb
ecclesiastical attire	Yes	No	No	No
ecclesiastical robe	Yes	No	No	No

As nouns, ecclesiastical attire and ecclesiastical robe are synonyms defined as:

ecclesiastical attire and ecclesiastical robe: attire that is appropriate to wear in a church

ecclesiastical attire (noun)	ecclesiastical robe (noun)
attire that is appropriate to wear in a church	attire that is appropriate to wear in a church