albatross vs millstone

albatross and millstone both are nouns.

Word	Noun	Adjective	Verb	Adverb
albatross	Yes	No	No	No
millstone	Yes	No	No	No

As nouns, albatross and millstone are synonyms defined as:

albatross and millstone: (figurative) something that hinders or handicaps

albatross (noun)	millstone (noun)
large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight	one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain
(figurative) something that hinders or handicaps	any load that is difficult to carry
	(figurative) something that hinders or handicaps