15-Letter Words Matching _Y_________T___

There are 20 15-letter words that match _Y_________T___. 4 are common words, such as HYPERACTIVITIES and SYLLABIFICATION. A rarer one is SYNCHRONISATION. In this set, I is the most frequent open letter (20 words). 2 words contain a doubled letter.

Full list 20

hyperactivitiessyllabificationsynchronizationsystematizationhypercorrectionsynchronicitiescyanoethylatingcyanoethylationcytophotometrichydroxylapatitehyperinvolutionhypermobilitieshyperparasitismhyperproductionhypersalinitieshypersalivationhypertonicitieshypervelocitieshypostatizationsynchronisation

About this list

Words
20 (4 common words)
Common example
hyperactivities
Rare example
synchronisation
Doubled letters
2
Ending in S
6
Most frequent letter
I (20)

Questions

How many 15-letter words matching _y_________t___ are there?

20. 4 of them are common words.

What is a common example?

HYPERACTIVITIES is among the common words in this set.