horsecar vs tramcar

horsecar and tramcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
horsecar	Yes	No	No	No
tramcar	Yes	No	No	No

As nouns, tramcar is a hypernym of horsecar; that is, tramcar is a word with a broader meaning than horsecar:

horsecar: an early form of streetcar that was drawn by horses
tramcar: a wheeled vehicle that runs on rails and is propelled by electricity

Other hypernyms of horsecar include streetcar, tram, trolley, trolley car.

horsecar (noun)	tramcar (noun)
an early form of streetcar that was drawn by horses	a four-wheeled wagon that runs on tracks in a mine
	a wheeled vehicle that runs on rails and is propelled by electricity