allosaurus vs allosaur

allosaurus and allosaur both are nouns.

Word	Noun	Adjective	Verb	Adverb
allosaurus	Yes	No	No	No
allosaur	Yes	No	No	No

As nouns, allosaurus and allosaur are synonyms defined as:

allosaurus and allosaur: late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus

allosaurus (noun)	allosaur (noun)
late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus	late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus