specialist; expert

field, sphere (of work), area (of study) / the area of one person's focus of work or study

speciality/specialty; subject of study; subject of expertise; area of interest; profession

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

a house / one's own home / a home, household / a family

expert, special

outside of one's field of expertise

academy (specialized school), vocational school