hindrance vs millstone

hindrance and millstone both are nouns.

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

As nouns, millstone is a hyponym of hindrance; that is, millstone is a word with a more specific, narrower meaning than hindrance:

hindrance: something immaterial that interferes with or delays action or progress
millstone: (figurative) something that hinders or handicaps

Other hyponyms of hindrance include albatross, bind, diriment impediment, drag, obstacle, obstruction, straitjacket.

hindrance (noun)	millstone (noun)
the act of hindering or obstructing or impeding	one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain
any obstruction that impedes or is burdensome	any load that is difficult to carry
something immaterial that interferes with or delays action or progress	(figurative) something that hinders or handicaps