diamondback, massasauga, sidewinder.
backache, beefsteak, bellyache, cheesecake, cupcake, daybreak, earthquake, fruitcake, handshake, headache, heartache, heartbreak, hotcake, intake, jailbreak, keepsake, kittiwake, mandrake, milkshake, muckrake.
Your query has returned 714 words, which include anagrams of rattlesnake as well as other shorter words that can be made using the letters included in rattlesnake.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.