specialist; expert

entomology

plenteous, abundant, ample, bounteous, rich

plenty, abundance, ampleness, bounty, richness

an insect (arthropod of class Insecta)

knowledge

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

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