This is going to sound nit-picking but I'm just illustrating the limits of any single term.
"Physicalism," like "materialism," is a word that says nothing about:
(1) canonics - doesn't tell you anything much about the role of logic and reason and how to think.
(2) ethics - doesn't tell you anything about the role of pleasure vs virtue, and really doesn't say much even about the gods, because some (even the Stoics apparently) take the position that supernatural gods are physical.
(3) and it also doesn't tell you anything much, even in physics, about whether the universe is subject to "hard determinism" or whether there is any degree of free agency.
This kind of analysis can be done with probably any single word, because I'm not aware that anyone has come up with essentially the same (or even closely similar) combination of crucial elements that are combined into the philosophy of Epicurus.