recognize, make out, distinguish, tell apart, pick out, tell, have an eye for, know, scent, differentiate, more...

indiscernible, indistinguishable

discernible, discernment, more...

scarce, best, first, wise, few, present, spiritual, penetrating, surety, last, light

can tell,   to see through,   clearly see,   make out by looking,   know what's what,   just make out,   barely make out,   see the difference,   could make out,   to know the truth