Adolf Grunbaum:
When we say that everything has a cause, we use the word “cause” to mean something that transforms previously existing materials from one state to another. But when we infer that the universe has a cause, we must mean by “cause” something that creates its effect out of nothing. Since these two meanings of “cause” are not the same, the argument is guilty of equivocation.

William Lane Craig‘s reply:
The univocal concept of “cause” employed throughout the argument is the concept of something which brings about or produces its effects. Whether this production involves transformation of already existing materials or creation out of nothing is an incidental question. Thus, the charge of equivocation is groundless.