curtain vs barrier

curtain and barrier both are nouns.

Word	Noun	Adjective	Verb	Adverb
curtain	Yes	No	Yes	No
barrier	Yes	No	No	No

As nouns, barrier is a hypernym of curtain; that is, barrier is a word with a broader meaning than curtain:

curtain: any barrier to communication or vision
barrier: anything serving to maintain separation by obstructing vision or access

curtain (noun)	barrier (noun)
hanging cloth used as a blind (especially for a window)	a structure or object that impedes free movement
any barrier to communication or vision	any condition that makes it difficult to make progress or to achieve an objective
	anything serving to maintain separation by obstructing vision or access

curtain (verb)	barrier (verb)
provide with drapery