13-Letter Words Matching _Y________O__

There are 17 13-letter words that match _Y________O__. 2 are common words, such as HYPERTENSIONS and TYPIFICATIONS. A rarer one is ZYGODACTYLOUS. In this set, S is the most frequent open letter (15 words). 1 words contain a doubled letter.

Full list 17

hypertensionstypificationsgymnospermoushymenopterouslymphosarcomasystematologycyclohexanonecytoskeletonshymenopteronshypercautioushyperreactorshypoeutectoidhypothecatorsmycetophagouspyrocatecholssympathectomyzygodactylous

About this list

Words
17 (2 common words)
Common example
hypertensions
Rare example
zygodactylous
Doubled letters
1
Ending in S
12
Most frequent letter
S (15)

Questions

How many 13-letter words matching _y________o__ are there?

17. 2 of them are common words.

What is a common example?

HYPERTENSIONS is among the common words in this set.