taper off vs peter out

taper off and peter out both are verbs.

Word	Noun	Adjective	Verb	Adverb
taper off	No	No	Yes	No
peter out	No	No	Yes	No

As verbs, taper off and peter out are synonyms defined as:

Other synonyms of taper off include fizzle, fizzle out.

taper off (verb)	peter out (verb)
become smaller or less active	use up all one's strength and energy and stop working
end weakly	end weakly