bring down vs lessen

bring down and lessen both are verbs.

Word	Noun	Adjective	Verb	Adverb
bring down	No	No	Yes	No
lessen	No	No	Yes	No

As verbs, lessen is a hypernym of bring down; that is, lessen is a word with a broader meaning than bring down:

Other hypernyms of bring down include decrease, minify.

bring down (verb)	lessen (verb)
cut down on; make a reduction in	decrease in size, extent, or range
impose something unpleasant	wear off or die down
cause to be enthusiastic	make become smaller
cause to come to the ground
move something or somebody to a lower position
cause the downfall of; of rulers