Python list.remove() not working as expected. It is removing from multiple lists when I'm clearly specifying only one [duplicate]

Question

If I am only removing words from the words_left list, why are they also being removed from the word_list and why is not removing 'maegan' which clearly does not have a 'b'.

word_list = ['susan', 'bill', 'terry', 'brian', 'black', 'ryan', 'maegan']
words_left = word_list

for word in word_list:
    if 'b' not in word:
        words_left.remove(word)
        
print(words_left)
print(word_list)

This returns:

['bill', 'brian', 'black', 'maegan']
['bill', 'brian', 'black', 'maegan']

Not, as I expected, this:

['bill', 'brian', 'black']
['susan', 'bill', 'terry', 'brian', 'black', 'ryan', 'maegan']

I'm clearly misunderstanding how the remove function works on lists or am missing something else that isn't entirely obvious to me.

Any help would be much appreciated.