Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Superiority is regular. It follows the -ies Conversion rule.
Use plural verbs: "The superiorities are ready" (not "is ready").
Yes. The plural superiorities is standard across all English variants.
The word superiority follows the standard English pluralization rule. When forming the plural, superiority becomes superiorities. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why superiority becomes superiorities helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using superiorities in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The superiorities are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.