LVT stands for Luxury Vinyl Tiles and LVP stands for Luxury Vinyl Planks. 
WPC products are sometimes mistakenly told to be the same as LVT/LVP, but that is incorrect. WPC and LVT/LVP are not the same thing. LVT/LVP is sometimes, but not always waterproof unlike WPC (which is always waterproof).
WPC products are considered to be luxury vinyl, but not all luxury vinyl is actually WPC. WPC is a type of specialty luxury vinyl that is waterproof.