Horned rattlesnake and Rattlesnake

Horned rattlesnake noun - Small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve.

Rattlesnake and horned rattlesnake are semantically related. In some cases you can use "Rattlesnake" instead a noun phrase "Horned rattlesnake".

Rattlesnake noun - Pit viper with horny segments at the end of the tail that rattle when shaken.

Horned rattlesnake and rattlesnake are semantically related. Sometimes you can replace phrase "Horned rattlesnake" with "Rattlesnake", this terms are similar.