grave mound vs barrow

grave mound and barrow both are nouns.

Word	Noun	Adjective	Verb	Adverb
grave mound	Yes	No	No	No
barrow	Yes	No	No	No

As nouns, grave mound and barrow are synonyms defined as:

grave mound and barrow: (archeology) a heap of earth placed over prehistoric tombs

Other synonyms of grave mound include burial mound, tumulus.

grave mound (noun)	barrow (noun)
(archeology) a heap of earth placed over prehistoric tombs	a cart for carrying small loads; has handles and one or more wheels
	(archeology) a heap of earth placed over prehistoric tombs
	the quantity that a barrow will hold