12-Letter Words Matching ____R____U__

There are 17 12-letter words that match ____R____U__. 3 are common words, such as HETEROSEXUAL and INTERREGNUMS. A rarer one is PELARGONIUMS. In this set, E is the most frequent open letter (16 words). 5 words contain a doubled letter.

Full list 17

heterosexualinterregnumsquadrenniumsantirrhinumsinterlingualintermixtureintertexturesuperconductsuperphylumssupersensualunderproduceaspergillumsinterboroughintercultureinterdiffuseinterstimulipelargoniums

About this list

Words
17 (3 common words)
Common example
heterosexual
Rare example
pelargoniums
Doubled letters
5
Ending in S
6
Most frequent letter
E (16)

Questions

How many 12-letter words matching ____r____u__ are there?

17. 3 of them are common words.

What is a common example?

HETEROSEXUAL is among the common words in this set.