Replace word with words

Question

Can someone please explain why i'm getting the same answer when replace word in the original code with words ?

words = ["hello", "world", "spam", "eggs"]
for words in words:
print(words + "!")

Answer 1

words = ["hello", "world", "spam", "eggs"]
for word in words:
print(word + "!")

loop index cannot be the same name with the name of list
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Moreover, you don't replace .. just print elements adding exclamation mark

Answer 2

There is no need to define it.
The scope of this variable/index is only inside the loop

Answer 3

So the word here is the loop index, but why that wasn't defined before ?