replace strings in unequal nested lists

I have an unequal nested list containing strings.

newlist=[['realoldbone', 'thenewhouse', 'oldking'],
         ['softhat', 'hatoldhat'],
         ['shirt', 'sweatshirt', 'myoldShirt']]

For two features say,

Features=["old","new"]

if the element in newlist contains an element of Features, I want to replace it with that element of Features. So, the final answer will be like this:

newlist=[['old', 'new', 'old'],
     ['softhat', 'old'],
     ['shirt', 'sweatshirt', 'old']]

I can’t think of a way how I can achieve this. I tried using for j in i for i in newlist type of loops along with string matching but to no avail. So,
I appreciate your suggestions.

>Solution :

The simplest case would be to loop through the lists and modify if feature exists:

for feature in Features:
    for lst in newlist:
        for i, item in enumerate(lst):
            if feature in item:
                lst[i] = feature
print(newlist)

Output:

[['old', 'new', 'old'], ['softhat', 'old'], ['shirt', 'sweatshirt', 'old']]