It depends on the computer architecture.
For 32bit,
bit = …1 bit…
nybble = 4 bits = 1/2 byte
byte = 8 bits = 2 nybbles
WORD = 2 bytes = 4 nybbles = 16 bits
DWORD = 2 WORDs = 4 bytes = 8 nybbles = 32 bits
QWORD = 2 DWORDs = 4 WORDs = ….. = 64 bits
On 64bit system, it will be double.