Rattler is a synonym of buzzworm.
As nouns the difference between rattler and buzzworm
is that rattler is (chiefly|us|informal) a rattlesnake while buzzworm is (slang) rattlesnake.
rattler
English
Noun
(
en noun)
(chiefly, US, informal) A rattlesnake.
A freight train or, (chiefly, British), a decrepit passenger train.
Something which rattles.
buzzworm
English
(Rattlesnake)
Synonyms
* rattlesnake
* rattler (colloquial, especially US )