15-Letter Words Matching _R__A__________

There are 12 15-letter words that match _R__A__________. 2 are common words, such as AROMATHERAPISTS and PREFABRICATIONS. A rarer one is TRYPANOSOMIASES. In this set, T is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 12

aromatherapistsprefabricationsarchaeopteryxesdramaturgicallytrypanosomiasisarchaebacteriumprecancellationpremanufacturedpremanufacturesprematurenessestrihalomethanestrypanosomiases

About this list

Words
12 (2 common words)
Common example
aromatherapists
Rare example
trypanosomiases
Doubled letters
3
Ending in S
8
Most frequent letter
T (12)

Questions

How many 15-letter words matching _r__a__________ are there?

12. 2 of them are common words.

What is a common example?

AROMATHERAPISTS is among the common words in this set.