subspecialize

• subspecialise (UK)

sub- +‎ specialize

subspecialize (third-person singular simple present subspecializes, present participle subspecializing, simple past and past participle subspecialized)

1. To specialize within a particular area of a specialty.
   • 2009 July 12, Amanda Petrusich, “They’ve Got Those Old, Hard-to-Find Blues”, in New York Times‎:

     Although most collectors subspecialize by genre, whether jazz or classical or country, it’s early American rural blues —— loose acoustic laments, recorded before 1935 and performed by artists who were born in or near the Mississippi Delta —— that inspires the highest prices and the most fevered pursuits.

• subspecialty, subspeciality
• subspecialist