rattler vs sidewinder

rattler and sidewinder both are nouns.

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

As nouns, sidewinder is a hyponym of rattler; that is, sidewinder is a word with a more specific, narrower meaning than rattler:

rattler: pit viper with horny segments at the end of the tail that rattle when shaken
sidewinder: small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve

rattler (noun)	sidewinder (noun)
pit viper with horny segments at the end of the tail that rattle when shaken	small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve
a railroad train consisting of freight cars	air-to-air missile with infrared homing device