Search 1 word in a cell with multiple words

Hello Everyone, I have one excel file with a list of allowed words to be checked in the second. they both have an ID column to make the match. here an example:

file1:

ID Words1

231 tree

432 apple

511 mug

434 cat

File 2:

ID Words2

231 tree, bee

432 car

511 mug, cherry, nut

434 dog

I want to highlight for the same ID all cells of file2 where words2 are not contained in words1 in file1. In the case of multiple words in the same cell also I want to highlight the words that don’t belong to the same file, like for ID 511 mug is present but there are also cherry and nut not contained, this I want to highlight too.

I did a first try with rule based raw filter but filter just the exact word, so ID 511 is not considered.

thank you