sidewinder vs rattlesnake

sidewinder and rattlesnake both are nouns.

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

As nouns, rattlesnake is a hypernym of sidewinder; that is, rattlesnake is a word with a broader meaning than sidewinder:

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

Other hypernyms of sidewinder include rattler.

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