1) Construction trades worker 2) Drywall worker 3) Skilled worker 4) Tradesman with a trowel 5) Trained worker 6) Worker on walls 
• (n.) One who applies plaster or mortar. • (n.) One who makes plaster casts.
Those who plaster walls in construction.
Plas'ter·er noun 1. One who applies plaster or mortar. 'Thy father was a plasterer .' Shak. 2. One who makes plaster casts. 'The plasterer doth make his figures by addition.' Sir H. Wotton. 
[n] - a worker skilled in applying plaster
noun a worker skilled in applying plaster