language barrier vs roadblock

language barrier and roadblock both are nouns.

Word	Noun	Adjective	Verb	Adverb
language barrier	Yes	No	No	No
roadblock	Yes	No	No	No

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

language barrier: barrier to communication resulting from speaking different languages
roadblock: any condition that makes it difficult to make progress or to achieve an objective

Other hypernyms of language barrier include barrier.

language barrier (noun)	roadblock (noun)
barrier to communication resulting from speaking different languages	a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
	any condition that makes it difficult to make progress or to achieve an objective