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