incumbrance vs obstruction

incumbrance and obstruction both are nouns.

Word	Noun	Adjective	Verb	Adverb
incumbrance	Yes	No	No	No
obstruction	Yes	No	No	No

As nouns, obstruction is a hypernym of incumbrance; that is, obstruction is a word with a broader meaning than incumbrance:

Other hypernyms of incumbrance include impediment, impedimenta, obstructer, obstructor.

incumbrance (noun)	obstruction (noun)
any obstruction that impedes or is burdensome	getting in someone's way
an onerous or difficult concern	the act of obstructing
a charge against property (as a lien or mortgage)	any structure that makes progress difficult
	something immaterial that stands in the way and must be circumvented or surmounted
	the physical condition of blocking or filling a passage with an obstruction