obstruction vs blockage

obstruction and blockage both are nouns.

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

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

Other hyponyms of obstruction include closure, occlusion, stall, stalling, obstruction of justice.

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

As nouns, obstruction and blockage are synonyms defined as:

obstruction and blockage: the physical condition of blocking or filling a passage with an obstruction

obstruction (noun)	blockage (noun)
getting in someone's way	the act of blocking
the act of obstructing	an obstruction in a pipe or tube
any structure that makes progress difficult	the physical condition of blocking or filling a passage with an obstruction
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