10-Letter Words Matching ____K__R__

There are 13 10-letter words that match ____K__R__. 7 are common words, such as BLACKBERRY and BLACKBIRDS. A rarer one is STICKWORKS. In this set, S is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 13

blackberryblackbirdsbrickworksclockworksknackwurstknockwurststockyardsbrickyardsknobkerriestinkhornscheckmarksfrankfurtsstickworks

About this list

Words
13 (7 common words)
Common example
blackberry
Rare example
stickworks
Doubled letters
2
Ending in S
9
Most frequent letter
S (11)

Questions

How many 10-letter words matching ____k__r__ are there?

13. 7 of them are common words.

What is a common example?

BLACKBERRY is among the common words in this set.