15-Letter Words Matching __________PH___

There are 20 15-letter words that match __________PH___. 3 are common words, such as AUTOBIOGRAPHERS and AUTOBIOGRAPHIES. A rarer one is SPECTROGRAPHIES. In this set, O is the most frequent open letter (20 words). 4 words contain a doubled letter.

Full list 20

autobiographersautobiographiesrephotographingdermatoglyphicshexachlorophenemicrosporophyllorganophosphatesubstratosphereanthroposophiesarteriographiescorticotrophinsenantiomorphismenantiomorphousmegagametophytemetallographersmetallographiesnonphilosophersoscillographiesprosopographiesspectrographies

About this list

Words
20 (3 common words)
Common example
autobiographers
Rare example
spectrographies
Doubled letters
4
Ending in S
13
Most frequent letter
O (20)

Questions

How many 15-letter words matching __________ph___ are there?

20. 3 of them are common words.

What is a common example?

AUTOBIOGRAPHERS is among the common words in this set.