prairie rattler vs rattler

prairie rattler and rattler both are nouns.

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

As nouns, rattler is a hypernym of prairie rattler; that is, rattler is a word with a broader meaning than prairie rattler:

prairie rattler: widely distributed between the Mississippi and the Rockies
rattler: pit viper with horny segments at the end of the tail that rattle when shaken

Other hypernyms of prairie rattler include rattlesnake.

prairie rattler (noun)	rattler (noun)
widely distributed between the Mississippi and the Rockies	pit viper with horny segments at the end of the tail that rattle when shaken
	a railroad train consisting of freight cars