11-Letter Words Matching ________RM_

There are 25 11-letter words that match ________RM_. 7 are common words, such as ANGIOSPERMS and BRAINSTORMS. A rarer one is THREADWORMS. In this set, O is the most frequent open letter (25 words). 4 words contain a doubled letter.

Full list 25

Common words

angiospermsbrainstormschloroformsechinodermsgymnospermsoutperformsschoolmarmsblastodermscankerwormsgymnospermyradiothermyscleroderma
angiospermsbrainstormschloroformsechinodermsgymnospermsoutperformsschoolmarmsblastodermscankerwormsgymnospermyradiothermysclerodermaagamospermycaddiswormsdisconfirmshomeothermshomeothermyletterformsnonconformsoverinformspalmerwormsphellodermsstenothermsthermoformsthreadworms

About this list

Words
25 (7 common words)
Common example
angiosperms
Rare example
threadworms
Doubled letters
4
Ending in S
20
Most frequent letter
O (25)

Questions

How many 11-letter words matching ________rm_ are there?

25. 7 of them are common words.

What is a common example?

ANGIOSPERMS is among the common words in this set.