Ultimate English Grammar, Vocabulary, and Names Database
Singular to Plural: By adding -s or -es to nouns ending in -o (List)
When we add -s or -es to nouns ending in -o, we create their plural forms. Here is a list of some common nouns ending in -o and the change that happens to them when they become plural. It is important to note that each word may have exceptions depending on its origin and common usage.
Noun: Hero, Plural: Heroes
Noun: Tomato, Plural: Tomatoes
Noun: Potato, Plural: Potatoes
Noun: Echo, Plural: Echoes
Noun: Embargo, Plural: Embargoes
Noun: Mosquito, Plural: Mosquitoes
Noun: Volcano, Plural: Volcanoes
Noun: Halo, Plural: Halos
Noun: Zero, Plural: Zeros
Noun: Piano, Plural: Pianos
Noun: Photo, Plural: Photos
Noun: Radio, Plural: Radios
Noun: Studio, Plural: Studios
Noun: Kangaroo, Plural: Kangaroos
Noun: Cuckoo, Plural: Cuckooes
Noun: Mango, Plural: Mangoes
Noun: Video, Plural: Videos
Noun: Memo, Plural: Memos
Noun: Tycoon, Plural: Tycoons
Noun: Buffalo, Plural: Buffalos or Buffaloes
Noun: Memento, Plural: Mementos
Noun: Inferno, Plural: Infernos
Noun: Tornado, Plural: Tornadoes
Noun: Torpedo, Plural: Torpedoes
Noun: Credo, Plural: Credos
Noun: Flamenco, Plural: Flamencos
Noun: Fresco, Plural: Frescoes
Noun: Cargo, Plural: Cargoes
Noun: Echo, Plural: Echoes
Noun: Domineo, Plural: Domineos
Noun: Quarto, Plural: Quartos
Noun: Shampoo, Plural: Shampoos
Noun: Tattoo, Plural: Tattoos
Noun: Vertigo, Plural: Vertigos
Noun: Albino, Plural: Albinos
Noun: Dino, Plural: Dinos
Noun: Ghetto, Plural: Ghettos
Noun: Grotto, Plural: Grottos
Noun: Audio, Plural: Audios
Noun: Canto, Plural: Cantos
Noun: Dynamo, Plural: Dynamos
Noun: Folio, Plural: Folios
Noun: Giro, Plural: Giros
Noun: Hippo, Plural: Hippos
Noun: Lido, Plural: Lidos
Noun: Maestro, Plural: Maestros
Noun: Rodeo, Plural: Rodeos
Noun: Trio, Plural: Trios
Noun: Quarto, Plural: Quartos
Words ending in -o form their plural in -os or -oes. Generally, those which have a vowel before the final -o simply take -s (e.g. videos, audios). Most words that have a consonant before the final -o add -es (e.g. heroes, potatoes). However, there are exceptions, and usage can change over time or vary between different varieties of English.
