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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Also are you using words[i].split('') with the parenthesis?
Have you checked your words[i] data type to ensure it's a string?
A test should be added for the same unique letters and length with a different count of each letter.
Otherwise this example could pass:
Example: anagrams('abbc', ['aabc'])
What is the time complexity for this?