Nous that change spelling to become plural are called irregular nouns. Some examples are:
The question is too vague. Please ask the question again with specific nouns.
The spelling of the plural noun, enrollees, is correct.
That is the correct spelling of the word "sky" (plural skies).
The correct spelling isdilemma.
That is the correct spelling of the plural noun fifths.
That is the correct spelling of the plural noun "tenants" (renters, residents).
The words oxen and buffaloes are correct plural spellings.The correct spelling of the other nouns are geese and knives.Note: the noun buffaloes can also be spelled buffalos.
Nouns ending in 's' form the plural by adding 'es' to the end of the word.The plural form of the noun 'waitress' is waitresses.
The correct spelling of the plural of cyclist is cyclists.
That is the correct spelling of the plural Spanish possessive pronoun (adjective for feminine nouns) meaning "our" or "ours" (nuestros, nuestras).
That is the correct spelling of "dingo" (Australian wild dog).
The spelling of the plural noun, enrollees, is correct.
That is the correct spelling of the word "sky" (plural skies).
The correct spelling is deaconesses.
That is the correct spelling of "trainer" (an athletic coach, or animal tamer).
That is the correct spelling of "firefighter" (fireman).
The correct spelling isdilemma.
That is the correct spelling of the plural word "baptisms".