9-Letter Words Matching ______AU_

There are 20 9-letter words that match ______AU_. 3 are common words, such as ASTRONAUT and CATERWAUL. A rarer one is WILLIWAUS. 2 words contain a doubled letter.

Full list 20

astronautcaterwaulcosmonautapatosaurbucentaurcybernautflambeausflambeauxhadrosaurpterosaurstegosauraboideausaboideauxaboiteausaboiteauxantifraudarchosaurhausfrausrousseauswilliwaus

About this list

Words
20 (3 common words)
Common example
astronaut
Rare example
williwaus
Doubled letters
2
Ending in S
6

Questions

How many 9-letter words matching ______au_ are there?

20. 3 of them are common words.

What is a common example?

ASTRONAUT is among the common words in this set.