Nouns ending in –o, -e change them in plural to –i: stipo - stipi, capo - capi, madre - madri, classe - classi. Masculine nouns ending in –a also change them to –i: poeta - poeti.

Feminine nouns ending in –a change it to –e: finestra - finestre, casa - case.

The other nouns do not change their plural form. These include, but are not limited to:

nouns ending in a stressed vowel (e.g. virtù);

monosyllabic nouns;

nouns ending in a consonant (film, sport);

nouns ending in –i and –ie.

A few nouns have quite unique forms: uomo - uomeni.

Finally, with compound nouns, the situation is quite complicated.