(pathology) color blindness

difficult / hard, probably impossible

to distinguish, to tell one thing from another / to classify

distinction, difference / classification

abnormal

abnormality

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

green