donkey cart vs ponycart

donkey cart and ponycart both are nouns.

Word	Noun	Adjective	Verb	Adverb
donkey cart	Yes	No	No	No
ponycart	Yes	No	No	No

As nouns, donkey cart and ponycart are synonyms defined as:

Other synonyms of donkey cart include pony cart, tub-cart.

donkey cart (noun)	ponycart (noun)
a cart with an underslung axle and two seats	a cart with an underslung axle and two seats