timber rattlesnake vs rattler

timber rattlesnake and rattler both are nouns.

Word	Noun	Adjective	Verb	Adverb
timber rattlesnake	Yes	No	No	No
rattler	Yes	No	No	No

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

timber rattlesnake: widely distributed in rugged ground of eastern United States
rattler: pit viper with horny segments at the end of the tail that rattle when shaken

Other hypernyms of timber rattlesnake include rattlesnake.

timber rattlesnake (noun)	rattler (noun)
widely distributed in rugged ground of eastern United States	pit viper with horny segments at the end of the tail that rattle when shaken
	a railroad train consisting of freight cars