15-Letter Words Matching __________R___L

There are 13 15-letter words that match __________R___L. 2 are common words, such as TRIGONOMETRICAL and UNCONTROVERSIAL. A rarer one is ULTRACOMMERCIAL. 1 words contain a doubled letter.

Full list 13

trigonometricaluncontroversialgalvanometricalisoperimetricalphotoelectricalpiezoelectricalamphitheatricalethnohistoricalnonmetaphoricalsemicylindricalsociohistoricaltranshistoricalultracommercial

About this list

Words
13 (2 common words)
Common example
trigonometrical
Rare example
ultracommercial
Doubled letters
1
Ending in S
0

Questions

How many 15-letter words matching __________r___l are there?

13. 2 of them are common words.

What is a common example?

TRIGONOMETRICAL is among the common words in this set.