3.2.3 Outline the meaning of the terms word, register and address and their
use in the storage of data and instructions.
Teaching Note:
The study of specific registers is not required.
JSR Notes:
Be sure you've got the difference between "word" and "register" straight. A register is a physical memory location with the CPU; so the smallest of the bigger cousins: cache, RAM and hard drives etc. Word is the term used to identify the amount of memory able to be passed around and worked with in a system. So we're talking a physical thing verses an amount of memory.
And, yes, the size of a computer's registers most often equates to its word size.
The teacher notes say that the study of specific registers is not required, but as you can probably imagine, there are various registers in the CPU that specialize in various parts of processing, such as address registers, data registers, conditional registers, and floating point registers, which help with real numbers. And as you would expect, the number of registers a CPU uses is most often is a significant binary number such as 32, 64, or 128, since the registers themselves will have addresses mad of a certain amount of bits.
Register and word size in most computers today are still 32 bits, but increasingly processors are 64 bit processors (with 64 bit registers, and the corresponding word size of 64 bits).