So the word PEPLUM is more encompassing and therefore more useful and, well, it just sounds right. To many film snobs though, a PEPLUM is a lower-grade European/Italian made film and to use the word PEPLUM for a Hollywood super-production like THE TEN COMMANDMENTS or BEN-HUR is wrong and an insult. Well, I disagree.
Drywall is a panel made of gypsum plaster pressed between two thick sheets of paper. It is used to make interior walls and ceilings. Drywall construction became prevalent as a speedier alternative to traditional lath and plaster. Sheetrock is a trademark for drywall made by the US Gypsum company. What it is.
MDF is an engineered wood composite that is similar to particle board, but is much denser and stronger than particle board. Imagine if all of the sawdust was swept up from other wood product manufacturing processes, and then that sawdust was mixed with binders and pressed into large sheets the size of plywood.