If you want to use for vocabulary sets like your example:

"keywords_1 = [(...), ('amusement', 'amusements', 'amuse', 'amuses', 'amused', 'amusing'), (...), ('hilarious', 'hilariously') (...)]"

I advice to you use "stemmer" and delete "stopword" before it.

for stemmer enter link description here for stopwords removing enter link description here

If you want to use for vocabulary sets like your example:

keywords_1 = [
    (...), 
    ('amusement', 'amusements', 'amuse', 'amuses', 'amused', 'amusing'),
    (...), 
    ('hilarious', 'hilariously'),
    (...)
]

I advise to you use stemmer and delete stopword before it.