embarrass vs bottleneck

embarrass is not a noun while bottleneck is a noun.

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

As verbs, bottleneck is a hyponym of embarrass; that is, bottleneck is a word with a more specific, narrower meaning than embarrass:

Other hyponyms of embarrass include stonewall, filibuster, check, hang.

embarrass (noun)	bottleneck (noun)
	the narrow part of a bottle near the top
	a narrowing that reduces the flow through a channel

embarrass (verb)	bottleneck (verb)
cause to be embarrassed; cause to feel self-conscious	become narrow, like a bottleneck
hinder or prevent the progress or accomplishment of	slow down or impede by creating an obstruction