level crossing vs carrefour

level crossing and carrefour both are nouns.

Word	Noun	Adjective	Verb	Adverb
level crossing	Yes	No	No	No
carrefour	Yes	No	No	No

As nouns, carrefour is a hypernym of level crossing; that is, carrefour is a word with a broader meaning than level crossing:

level crossing: intersection of a railway and a road on the same level; barriers close road when trains pass
carrefour: a junction where one street or road crosses another

Other hypernyms of level crossing include crossing, crossroad, crossway, intersection.

level crossing (noun)	carrefour (noun)
intersection of a railway and a road on the same level; barriers close road when trains pass	a junction where one street or road crosses another