let up vs abate

let up and abate both are verbs.

Word	Noun	Adjective	Verb	Adverb
let up	No	No	Yes	No
abate	No	No	Yes	No

As verbs, let up and abate are synonyms defined as:

Other synonyms of let up include die away, slack, slack off.

let up (verb)	abate (verb)
become less in amount or intensity	become less in amount or intensity
reduce pressure or intensity	make less active or intense