15-Letter Words Matching ____________T_R

There are 15 15-letter words that match ____________T_R. 1 are common words, such as PHOTOTYPESETTER and MICROMILLIMETER. A rarer one is TRANSMISSOMETER. In this set, O is the most frequent open letter (15 words). 4 words contain a doubled letter.

Full list 15

phototypesettermicromillimeterphototransistorprestidigitatorradiomicrometertelethermometerthermobarometerultramicrometervasoconstrictorcircumnavigatorimmunomodulatormechanoreceptormicrophotometerthermoregulatortransmissometer

About this list

Words
15 (1 common words)
Common example
phototypesetter
Rare example
transmissometer
Doubled letters
4
Ending in S
0
Most frequent letter
O (15)

Questions

How many 15-letter words matching ____________t_r are there?

15. 1 of them are common words.

What is a common example?

PHOTOTYPESETTER is among the common words in this set.