A poster for the latest Star Wars movie:
Is that the last Jedi warrior (sg) or the last Jedi warriors (pl)? You can’t tell for sure, since the noun noun Jedi ‘Jedi warrior’ is the same in sg and pl, as in these two examples from the Wikipedia page on them:
[pl] The Jedi … are the main protagonists in the Star Wars universe.
[sg] A Jedi’s ideology and strict way of life as a worthwhile challenge to live up to is a recurring theme in the Star Wars universe.