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

noun.animal

6 Subcategories

adder, common viper, Vipera berus go
small terrestrial viper common in northern Eurasia
asp, asp viper, Vipera aspis go
of southern Europe
puff adder, Bitis arietans go
large African viper that inflates its body when alarmed
gaboon viper, Bitis gabonica go
large heavy-bodied brilliantly marked and extremely venomous west African viper
sand viper, horned viper, cerastes, horned asp, Cerastes cornutus go
highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
pit viper go
New World vipers with hollow fangs and a heat-sensitive pit on each side of the head