4-Letter Words Matching K_R_

There are 12 4-letter words that match K_R_. 3 are common words, such as KART and KERB. A rarer one is KURU. In this set, E is the most frequent open letter (5 words). 0 words contain a doubled letter.

Full list 12

kartkerbkirkkerfkernkerokorskarnkirnkirskorekuru

About this list

Words
12 (3 common words)
Common example
kart
Rare example
kuru
Doubled letters
0
Ending in S
2
Most frequent letter
E (5)

Questions

How many 4-letter words matching k_r_ are there?

12. 3 of them are common words.

What is a common example?

KART is among the common words in this set.