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