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What is Byte Addressable and Word Addressable  means in computer Architecture ? Difference between them with examples?

I also find some sources like stack overflow and wikipedia ? But still i couln't able to understand

http://stackoverflow.com/questions/2724449/different-between-word-addressable-and-byte-addressable
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I will explain this by example

suppose,

you have a 128 KB memory if the memory is byte addressable then

no of bits for a physical address is 17 bit.

if the memory is a word addressable and word size is 4B then it is converted first converted to word 128KB/ 4B = 32KB then no. of bits for a physical address is 15 bit.
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Byte addressable - To represent word in memory computer uses Bytes of code. i.e. called Byte Addressable

Word Addressable- It represents ordered Byte in a word.

If a memory block has 16 B  word of data

and it is 8B word addressable

Then there are only 16/8 =2 words
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Memory is represented in BYTES as word will give ambiguity but operations are processed in word addressable.

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