8-Letter Words Matching _S_____R

There are 20 8-letter words that match _S_____R. 5 are common words, such as ASSESSOR and ASSIGNER. A rarer one is OSTIOLAR. In this set, A is the most frequent open letter (18 words). 12 words contain a doubled letter.

Full list 20

assessorassignerassignorespalierislanderascenderassailerassenterassentorasserterassorterespouserisolatorasperseraspersorassertorassisterassistorossifierostiolar

About this list

Words
20 (5 common words)
Common example
assessor
Rare example
ostiolar
Doubled letters
12
Ending in S
0
Most frequent letter
A (18)

Questions

How many 8-letter words matching _s_____r are there?

20. 5 of them are common words.

What is a common example?

ASSESSOR is among the common words in this set.