11-Letter Words Matching ____K_____R

There are 18 11-letter words that match ____K_____R. 6 are common words, such as BLACKMAILER and BLOCKBUSTER. A rarer one is TRUCKMASTER. In this set, E is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 18

blackmailerblockbusterfrankfurterquicksilverstockbrokerstockholderdoorknockerdrunkometerquacksalverstockjobberblackbirderblackhanderblacklisterbreakfasterstockkeeperthankfullertrackwalkertruckmaster

About this list

Words
18 (6 common words)
Common example
blackmailer
Rare example
truckmaster
Doubled letters
4
Ending in S
0
Most frequent letter
E (18)

Questions

How many 11-letter words matching ____k_____r are there?

18. 6 of them are common words.

What is a common example?

BLACKMAILER is among the common words in this set.