13-Letter Words Matching ________O__U_

There are 19 13-letter words that match ________O__U_. 3 are common words, such as INSECTIVOROUS and STREPTOCOCCUS. A rarer one is POLYCHOTOMOUS. 7 words contain a doubled letter.

Full list 19

insectivorousstreptococcustablespoonfulallochthonousanticlinoriumautochthonousferrochromiumgraminivorousheterosporousnonhomologoussuccinctoriumtubuliflorouscavernicolousdecamethoniumhexamethoniummeningococcusnonautonomousodontoglossumpolychotomous

About this list

Words
19 (3 common words)
Common example
insectivorous
Rare example
polychotomous
Doubled letters
7
Ending in S
12

Questions

How many 13-letter words matching ________o__u_ are there?

19. 3 of them are common words.

What is a common example?

INSECTIVOROUS is among the common words in this set.