7-Letter Words Matching O_____M

There are 17 7-letter words that match O_____M. 3 are common words, such as OPOSSUM and OPTIMUM. A rarer one is OUTSWUM. In this set, S is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 17

opossumoptimumoverarmomentumonanismoospermosculumoviformobelismoestrumogreismoralismorganumoutbeamoutswamoutswimoutswum

About this list

Words
17 (3 common words)
Common example
opossum
Rare example
outswum
Doubled letters
2
Ending in S
0
Most frequent letter
S (11)

Questions

How many 7-letter words matching o_____m are there?

17. 3 of them are common words.

What is a common example?

OPOSSUM is among the common words in this set.