13-Letter Words Matching ________A__U_

There are 21 13-letter words that match ________A__U_. 1 are common words, such as TYRANNOSAURUS and ACTINOURANIUM. A rarer one is TETRADYNAMOUS. In this set, O is the most frequent open letter (20 words). 2 words contain a doubled letter.

Full list 21

tyrannosaurusactinouraniumautocephalousbrachiosauruscarcinomatousentomophagousichthyosaurusovoviviparousstenopetalousarmamentariumcleistogamouscondylomatousdiathermanousemphysematousexanthematousgranulomatoushematophagousmycetophagousnonmonogamouspapillomatoustetradynamous

About this list

Words
21 (1 common words)
Common example
tyrannosaurus
Rare example
tetradynamous
Doubled letters
2
Ending in S
19
Most frequent letter
O (20)

Questions

How many 13-letter words matching ________a__u_ are there?

21. 1 of them are common words.

What is a common example?

TYRANNOSAURUS is among the common words in this set.