rattle vs rattler

rattle and rattler both are nouns.

Word	Noun	Adjective	Verb	Adverb
rattle	Yes	No	Yes	No
rattler	Yes	No	No	No

rattle (noun)	rattler (noun)
loosely connected horny sections at the end of a rattlesnake's tail	pit viper with horny segments at the end of the tail that rattle when shaken
a baby's toy that makes percussive noises when shaken	a railroad train consisting of freight cars
a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders)

rattle (verb)	rattler (verb)
shake and cause to make a rattling noise
make short successive sounds