bottleneck vs constriction

bottleneck and constriction both are nouns.

Word	Noun	Adjective	Verb	Adverb
bottleneck	Yes	No	Yes	No
constriction	Yes	No	No	No

As nouns, bottleneck and constriction are synonyms defined as:

bottleneck and constriction: a narrowing that reduces the flow through a channel

Other synonyms of bottleneck include chokepoint.

bottleneck (noun)	constriction (noun)
the narrow part of a bottle near the top	the action or process of compressing
a narrowing that reduces the flow through a channel	a tight feeling in some part of the body
	tight or narrow compression
	a narrowing that reduces the flow through a channel

bottleneck (verb)	constriction (verb)
become narrow, like a bottleneck
slow down or impede by creating an obstruction