applied physics

specialist; expert

physics (as an area of study)

to apply

application

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

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

physics, the physical aspects of a phenomenon or a system

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