impediment vs barrier

impediment and barrier both are nouns.

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

As nouns, barrier is a hyponym of impediment; that is, barrier is a word with a more specific, narrower meaning than impediment:

impediment (noun)	barrier (noun)
any structure that makes progress difficult	a structure or object that impedes free movement
something immaterial that interferes with or delays action or progress	any condition that makes it difficult to make progress or to achieve an objective
	anything serving to maintain separation by obstructing vision or access