First declension nouns

Masculine plurals in а/я

There are hundreds of first declension masculine nouns that have an irregular nominative plural in а or я. Hard nouns show the former ending, thus nominative singular профе́ссор becomes nominative plural профессора́, and soft nouns show the latter, thus nominative singular учи́тель becomes nominative plural учителя́. Outside of this one quirk, these nouns behave exactly like end-stressed hard and soft first declension nouns in the plural. Among those nouns are:

паспорт лес город череп доктор берег век глаз жемчуг голос повар борт рог холод рукав свитер поезд отпуск профессор остров вечер парус