13-Letter Words Matching _L________R__

There are 12 13-letter words that match _L________R__. 2 are common words, such as ELECTIONEERED and PLASTERBOARDS. A rarer one is PLETHYSMOGRAM. In this set, O is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

electioneeredplasterboardsaluminothermyblastospheresclapperboardselectrophorusflavopurpurinfloricultureselectioneererfloriculturalflutterboardsplethysmogram

About this list

Words
12 (2 common words)
Common example
electioneered
Rare example
plethysmogram
Doubled letters
4
Ending in S
6
Most frequent letter
O (12)

Questions

How many 13-letter words matching _l________r__ are there?

12. 2 of them are common words.

What is a common example?

ELECTIONEERED is among the common words in this set.