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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

living thing, animate thing go
a living (or once living) entity

organism, being go
a living thing that has (or can develop) the ability to act or function independently

animal, animate being, beast, brute, creature, fauna go
a living organism characterized by voluntary movement

chordate go
any animal of the phylum Chordata having a notochord or spinal column

vertebrate, craniate go
animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium

reptile, reptilian go
any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms

diapsid, diapsid reptile go
reptile having a pair of openings in the skull behind each eye

snake, serpent, ophidian go
limbless scaly elongate reptile

viper go
venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw

pit viper go
New World vipers with hollow fangs and a heat-sensitive pit on each side of the head

rattlesnake, rattler
pit viper with horny segments at the end of the tail that rattle when shaken

noun.animal

11 Subcategories

diamondback, diamondback rattlesnake, Crotalus adamanteus go
large deadly rattlesnake with diamond-shaped markings
timber rattlesnake, banded rattlesnake, Crotalus horridus horridus go
widely distributed in rugged ground of eastern United States
prairie rattlesnake, prairie rattler, Western rattlesnake, Crotalus viridis go
widely distributed between the Mississippi and the Rockies
sidewinder, horned rattlesnake, Crotalus cerastes go
small pale-colored desert rattlesnake of southwestern United States
Western diamondback, Western diamondback rattlesnake, Crotalus atrox go
largest and most dangerous North American snake
rock rattlesnake, Crotalus lepidus go
mountain rock dweller of Mexico and most southern parts of United States southwest
tiger rattlesnake, Crotalus tigris go
having irregularly cross-banded back
Mojave rattlesnake, Crotalus scutulatus go
extremely dangerous
speckled rattlesnake, Crotalus mitchellii go
markings vary but usually harmonize with background
massasauga, massasauga rattler, Sistrurus catenatus go
pygmy rattlesnake found in moist areas from the Great Lakes to Mexico
massasauga, ground rattler, Sistrurus miliaris go
small pygmy rattlesnake