carte du jour vs carte

carte du jour and carte both are nouns.

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

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

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

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