horse-cart vs horse cart

horse-cart and horse cart both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse-cart	Yes	No	No	No
horse cart	Yes	No	No	No

As nouns, horse-cart and horse cart are synonyms defined as:

horse-cart and horse cart: heavy cart; drawn by a horse; used for farm work

horse-cart (noun)	horse cart (noun)
heavy cart; drawn by a horse; used for farm work	heavy cart; drawn by a horse; used for farm work