fencing vs barrier

fencing and barrier both are nouns.

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

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

fencing (noun)	barrier (noun)
the art or sport of fighting with swords (especially the use of foils or epees or sabres to score points under a set of rules)	a structure or object that impedes free movement
a barrier that serves to enclose an area	any condition that makes it difficult to make progress or to achieve an objective
material for building fences	anything serving to maintain separation by obstructing vision or access