SPECIALISM
specialization, specialisation, specialty, speciality, specialism
(noun) the special line of work you have adopted as your career; “his specialization is gastroenterology”
specialism
(noun) the concentration of your efforts on a particular field of study or occupation
Source: WordNet® 3.1
Etymology
Noun
specialism (countable and uncountable, plural specialisms)
(countable) Speciality.
(uncountable) The concentration of one's efforts upon a particular field of study.
Source: Wiktionary
Spe"cial*ism, n.
Definition: Devotion to a particular and restricted part or branch of
knowledge, art, or science; as, medical specialism.
Source: Webster’s Unabridged Dictionary 1913 Edition