10-Letter Words Matching _______E_M

There are 20 10-letter words that match _______E_M. 9 are common words, such as ANGIOSPERM and DOWNSTREAM. A rarer one is STOMODAEUM. In this set, R is the most frequent open letter (17 words). 2 words contain a doubled letter.

Full list 20

angiospermdownstreamechinodermgymnospermmainstreammillstreamperitoneumslipstreamunderwhelmapophthegmblastodermheadstreamhomeothermperiosteumphellodermpropylaeumplasmodesmsidestreamstenothermstomodaeum

About this list

Words
20 (9 common words)
Common example
angiosperm
Rare example
stomodaeum
Doubled letters
2
Ending in S
0
Most frequent letter
R (17)

Questions

How many 10-letter words matching _______e_m are there?

20. 9 of them are common words.

What is a common example?

ANGIOSPERM is among the common words in this set.