diamondback vs rattler

diamondback and rattler both are nouns.

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

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

diamondback: large deadly rattlesnake with diamond-shaped markings
rattler: pit viper with horny segments at the end of the tail that rattle when shaken

Other hypernyms of diamondback include rattlesnake.

diamondback (noun)	rattler (noun)
large deadly rattlesnake with diamond-shaped markings	pit viper with horny segments at the end of the tail that rattle when shaken
	a railroad train consisting of freight cars