10-Letter Words Matching ____Y__O__

There are 20 10-letter words that match ____Y__O__. 8 are common words, such as BALLYHOOED and DONNYBROOK. A rarer one is TRIHYDROXY. 11 words contain a doubled letter.

Full list 20

ballyhooeddonnybrookembryologyhoneymoonsmartyrdomspussyfootsstorybooksterryclothcandyflossdiphyllousdiphyodontembryotomyentryphoneepicycloidputtyrootsdictyosomeearlywoodsmethyldopapuppyhoodstrihydroxy

About this list

Words
20 (8 common words)
Common example
ballyhooed
Rare example
trihydroxy
Doubled letters
11
Ending in S
9

Questions

How many 10-letter words matching ____y__o__ are there?

20. 8 of them are common words.

What is a common example?

BALLYHOOED is among the common words in this set.