barrow vs grave mound

barrow and grave mound both are nouns.

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

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

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

Other synonyms of barrow include burial mound, tumulus.

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