12-Letter Words Matching ___L_____R__

There are 15 12-letter words that match ___L_____R__. 3 are common words, such as BILLIONAIRES and MILLIONAIRES. A rarer one is ZILLIONAIRES. In this set, O is the most frequent open letter (14 words). 9 words contain a doubled letter.

Full list 15

billionairesmillionairesphilodendronachlorhydriamilliamperesscolopendridwoolgatheredachlorhydriccyclodextrinfellmongeredscolopendrasthalassocrattrellisworkswoolgathererzillionaires

About this list

Words
15 (3 common words)
Common example
billionaires
Rare example
zillionaires
Doubled letters
9
Ending in S
6
Most frequent letter
O (14)

Questions

How many 12-letter words matching ___l_____r__ are there?

15. 3 of them are common words.

What is a common example?

BILLIONAIRES is among the common words in this set.