15-Letter Words Matching __D__________T_

There are 13 15-letter words that match __D__________T_. 2 are common words, such as RADIOTHERAPISTS and UNDERSTATEMENTS. A rarer one is RADIOBIOLOGISTS. In this set, I is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 13

radiotherapistsunderstatementsindefensibilityindigestibilityindissolubilityundependabilitydedifferentiatehydrobiologistshydroxylapatiteindefeasibilityindefectibilityindifferentistsradiobiologists

About this list

Words
13 (2 common words)
Common example
radiotherapists
Rare example
radiobiologists
Doubled letters
3
Ending in S
5
Most frequent letter
I (12)

Questions

How many 15-letter words matching __d__________t_ are there?

13. 2 of them are common words.

What is a common example?

RADIOTHERAPISTS is among the common words in this set.