Final answer:
The misspelled word in the sentence is 'enjoy'. It should be 'enjoys' to agree in number with the singular subject 'Anyone'.
Step-by-step explanation:
The misspelling in the sentence "Anyone who assembles comic book collections probably enjoy superheroes." is in the verb 'enjoy'. Since the subject 'Anyone' is singular, the verb should also be in the singular form to match in number, making the correct verb 'enjoys'. Therefore, the correct sentence should be: "Anyone who assembles comic book collections probably enjoys superheroes." Understanding subject-verb agreement is essential in sentence construction to ensure that the sentence is grammatically correct.