what does the following do exactly ?
MyWordArray = 0
I would not expect that to compile as "MyWordArray" is a pointer to a memory address.

MyWordArray[0]=0 is the correct syntax to set the first word in the array to = 0
MyWordArray[1]=0 for the next word

AWord VAR WORD
MyWordArray VAR WORD[8]
AWord = 0
MyWordArray = AWord

MyWordArray[0] = AWord is whats required