Bit is a portmanteau of binary digit.
A byte is 8 bits.
A nibble is 4 bits (half a byte).
Is there a word for a pair of bytes?
They are (in order of increasing size)
Please note that a
You can read more about assembler(binary) here (this is a random link I found on google for your reference, but I verified that the information is correct about the above mentioned. Search on google).
I will offer this up as a suggestion, though I don't believe it was ever used in serious writing. A playte is unambiguously 16 bits, and also; chawmp in the context of a 32 bit machine.
I would've just commented on the previous answer but I don't have enough reputation yet, so I'll leave an alternate answer instead.
Also, I believe nybble is the correct spelling for four bits.