The word Plesiosuar is misspelled against Plesiosaur, a noun meaning "One of the Plesiosauria."
-->
Word contains consecutive vowels 'AU' in between alphabets plesios & r is misspelled as 'UA'
Wrong Spelling:  plesios-ua-r 
Correct Spelling:  plesios-au-r 
Check more misspelled words of Plesiosaur to spell it correct.