block vs obstruction

block and obstruction both are nouns.

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

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

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

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

block (noun)	obstruction (noun)
the act of obstructing or deflecting someone's movements	getting in someone's way
a solid piece of something (usually having flat rectangular sides)	the act of obstructing
an obstruction in a pipe or tube	any structure that makes progress difficult
a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope	something immaterial that stands in the way and must be circumvented or surmounted
a metal casting containing the cylinders and cooling ducts of an engine	the physical condition of blocking or filling a passage with an obstruction
a platform from which an auctioneer sells
housing in a large building that is divided into separate units
an inability to remember or think of something you normally can do; often caused by emotional tension
a number or quantity of related things dealt with as a unit
a rectangular area in a city surrounded by streets and usually containing several buildings
(computer science) a sector or group of sectors that function as the smallest data unit permitted
a three-dimensional shape with six square or rectangular sides

block (verb)	obstruction (verb)
shape into a block or blocks
shape by using a block
prohibit the conversion or use of (assets)
be unable to remember
interfere with or prevent the reception of signals
impede the movement of (an opponent or a ball)
render unsuitable for passage
obstruct
stamp or emboss a title or design on a book with a block
support, secure, or raise with a block
block passage through
shut out from view or get in the way so as to hide from sight
interrupt the normal function of by means of anesthesia
hinder or prevent the progress or accomplishment of
stop from happening or developing
run on a block system