carte vs carte du jour

carte and carte du jour both are nouns.

Word	Noun	Adjective	Verb	Adverb
carte	Yes	No	No	No
carte du jour	Yes	No	No	No

As nouns, carte and carte du jour are synonyms defined as:

Other synonyms of carte include bill of fare, card, menu.

carte (noun)	carte du jour (noun)
a list of dishes available at a restaurant	a list of dishes available at a restaurant