10-Letter Words Matching ____Y___M_

There are 13 10-letter words that match ____Y___M_. 5 are common words, such as ECOSYSTEMS and MARTYRDOMS. A rarer one is PTERYGIUMS. In this set, S is the most frequent open letter (12 words). 1 words contain a doubled letter.

Full list 13

ecosystemsmartyrdomsneodymiumspachydermssubsystemscollyriumsembryotomysyncytiumsuropygiumsdictyosomelathyrismsnonsystemspterygiums

About this list

Words
13 (5 common words)
Common example
ecosystems
Rare example
pterygiums
Doubled letters
1
Ending in S
11
Most frequent letter
S (12)

Questions

How many 10-letter words matching ____y___m_ are there?

13. 5 of them are common words.

What is a common example?

ECOSYSTEMS is among the common words in this set.