protoactinium /prō-tō-ak-tinˈi-əm/ (chem)

• Plough Monday
• plough on
• plough one's way through
• ploughs
• ploughshare
• ploughshare bone
• ploughshares
• plough-staff
• plough-staffs
• plough-stilt
• plough-stilts
• plough-tail
• plough-tails
• plough-team
• plough-teams
• plough the sands
• plough through
• plough-tree
• plough-trees
• ploughwise
• ploughwright
• ploughwrights
• plouk
• ploukie
• ploukier