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There are 18 ten-letter words containing OSAUR

ALLOSAURUS	• allosaurus n. A large, carnivorous dinosaur, of genus Allosaurus, that lived in the Jurassic period. • Allosaurus prop.n. A taxonomic genus within the family Allosauridae – theropod dinosaurs. • ALLOSAURUS n. a kind of dinosaur.
ANKYLOSAUR	• ankylosaur n. Synonym of ankylosaurus. • ANKYLOSAUR n. a kind of dinosaur with a club tail, also ANKYLOSAURUS.
APATOSAURS	• apatosaurs n. Plural of apatosaur. • APATOSAUR n. a kind of long-necked dinosaur, also APATOSAURUS.
ARCHOSAURS	• archosaurs n. Plural of archosaur. • ARCHOSAUR n. any of a subclass of reptiles comprising pterosaurs, dinosaurs and crocodilians.
BRONTOSAUR	• brontosaur n. Any member of the genus Brontosaurus. • BRONTOSAUR n. any of a genus of large sauropod dinosaurs of the Jurassic, also BRONTOSAURUS.
CARNOSAURS	• carnosaurs n. Plural of carnosaur. • CARNOSAUR n. a meat-eating dinosaur.
COTYLOSAUR	• cotylosaur n. (Paleontology, dated) A member of the Cotylosauria, a synonym of the family †Captorhinidae, the earliest… • COTYLOSAUR n. an extinct primitive reptile with massive body and short legs.
DEINOSAURS	• deinosaurs n. Plural of deinosaur. • DEINOSAUR n. any of a group of extinct reptiles, also DINOSAUR.
DINOSAURIC	• dinosauric adj. (Rare) Dinosaurian. • DINOSAURIC adj. of or like a dinosaur, also DINOSAURIAN.
ELASMOSAUR	• elasmosaur n. Any plesiosaur of the genus Elasmosaurus. • ELASMOSAUR n. a very long-necked extinct marine reptile, a type of plesiosaur.
HADROSAURS	• hadrosaurs n. Plural of hadrosaur. • HADROSAUR n. a bird-hipped dinosaur of the Cretaceous.
MEGALOSAUR	• megalosaur n. A carnivorous dinosaur of the family Megalosauridae. • MEGALOSAUR n. a large dinosaur, also MEGALOSAURIAN, MEGALOSAURUS.
PELYCOSAUR	• pelycosaur n. Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade… • PELYCOSAUR n. a kind of dinosaur.
PLESIOSAUR	• plesiosaur n. Any of several extinct marine reptiles, of the order Plesiosauria, from the Jurassic and Cretaceous periods. • PLESIOSAUR n. any of a group of extinct marine reptiles of Mesozoic times.
PTEROSAURS	• pterosaurs n. Plural of pterosaur. • PTEROSAUR n. a pterodactyl, also PTEROSAURIAN.
STEGOSAURS	• stegosaurs n. Plural of stegosaur. • STEGOSAUR n. a herbivorous dinosaur of the Jurassic period, also STEGOSAURUS.
TELEOSAURS	• teleosaurs n. Plural of teleosaur. • TELEOSAUR n. an extinct marine crocodile, having a slender snout and short front legs.
TITANOSAUR	• titanosaur n. Any member of the taxonomic groups Titanosauria or Titanosauroidea of diverse sauropod dinosaurs including… • TITANOSAUR n. a very large dinosaur.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

See this list for:

English Wiktionary: 70 words
Scrabble in French: 8 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 8 words
Scrabble in German: no word
Scrabble in Romanian: 1 word

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