hindrance vs obstacle

hindrance and obstacle both are nouns.

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

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

hindrance: something immaterial that interferes with or delays action or progress
obstacle: something immaterial that stands in the way and must be circumvented or surmounted

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

hindrance (noun)	obstacle (noun)
the act of hindering or obstructing or impeding	an obstruction that stands in the way (and must be removed or surmounted or circumvented)
any obstruction that impedes or is burdensome	something immaterial that stands in the way and must be circumvented or surmounted
something immaterial that interferes with or delays action or progress