عَامِلَةٌۭ نَّاصِبَةٌۭ
Sentence structure
عَامِلَةٌ and نَّاصِبَةٌ continue the description of the faces; both are feminine-singular nominative active participles.
Ayah summary
They will be worn out by severe toil.
عَامِلَةٌۭ — Laboring
Grammar: An indefinite feminine-singular nominative active participle continuing the description of وُجُوهٌ.
نَّاصِبَةٌۭ — exhausted
Grammar: An indefinite feminine-singular nominative active participle coordinated in the same description.