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.