How many bits is a WORD and is that constant over different architectures?

Question

Is a machine WORD always the same or does it depend on the machine architecture? And is the meaning of the word WORD context sensitive or generally applicable?

Answer 1

A "word" in small letters depends on the architecture.

A "WORD" in capital letters, as defined in Windows SDK, is 16 bits.

Similarly: "DWORD" - (double word) 32 bits. "QWORD" ... 64 bits.