ankylosaurus vs ankylosaur

ankylosaurus and ankylosaur both are nouns.

Word	Noun	Adjective	Verb	Adverb
ankylosaurus	Yes	No	No	No
ankylosaur	Yes	No	No	No

As nouns, ankylosaurus and ankylosaur are synonyms defined as:

ankylosaurus and ankylosaur: having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's

ankylosaurus (noun)	ankylosaur (noun)
having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's	having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's