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There is no hard-and-fast rule with regard to forming the plural forms of nouns ending in O. Some nouns adopt the ending -es, such as heroes, tomatoes, potatoes. Other nouns (especially those with two ending vowels) simply adopt an S, such as cameos, patios. Others appear in both forms: zeros/zeros, volcano/volcanoes, tornados/tornadoes. (The -es in these three is the dominant usage.)
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Q: What is the plural form for words ending in o?
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What words ending in o form their plural by adding s only?

Some words ending in o that form their plural by adding s only include: pianos, duos, solos, tacos.


Plural forms of words ending with o?

Nouns that end in 'o' in their singular form can take an 's' or an 'es' for their plural form. Some examples:echo to echoeshero to heroespotato to potatoesveto to vetoesauto to autosphoto to photosstudio to studiospiano to pianos


What words can you add a s to most words that end with o?

Nouns ending with -o that form the plural by adding -s to the end of the word are:autoscameoskangarooskilosmemosphotospianossolosstudiostattoosvideoszoos


Plural word s ending in o?

Some plural words ending in "o" are photos, pianos, casinos, and zoos.


How do you spell the plural form of piano?

plural: pianosMost words ending with an 'o' usually take '-es' to form the plural, but some words take '-s', e.g. pianos, radios, videos, etc.


What words ending in o form their plural by adding s only at 5 least?

Cello > cellosDisco > discosRadio > radiosPhoto > photosPatio > patios


Why is the plural of auto autos and the plural of hero heroes?

Because there is no standard rule for words ending in -o.


Why is the plural of photo photos not photoes?

The plural form photos is an exception to the rule that words which end with -o preceeded by a consonant have -es added to create the plural form.


Nouns ending in o that form plural by adding only s?

Examples of nouns ending with -o that just add -s to form the plural are:auto - autoscameo - cameoskangaroo - kangarooskilo - kilosmemo - memosphoto - photospiano - pianossoprano - sopranosstudio - studiostattoo - tattoosvideo - videoszoo - zoos


Words the require ES to make them plural?

The nouns ending in ch, sh, s, x, and z add -es to the end of the word to form the plural. Only some nouns ending in o use -es to form the plural.Examples:church, churcheswish, wishesdress, dressesbox, boxeswaltz, waltzespotato, potatoeshero, heroes


Why is tomato plural with an es?

Some nouns ending with an 'o' preceded by a consonant add 'es' to the end of the word to form the plural; for example:tomato - tomatoespotato - potatoeshero - heroesecho - echoesbuffalo - buffaloesmosquito - mosquitoesMost nouns ending with an 'o' simply add 's' to the end of the word to form the plural; for example:zero - zeroszoo - zoosstudio - studiosradio - radiosavacado - avacadosauto - autos


What is the plural of a noun ending in o?

Unfortunately there is no simple rules for using 's' or 'es' to change nouns ending in 'o' into the plural form. How fortunate we are to live in the age of spell check, otherwise you need a hard copy dictionary or a good memory. Some examples are:echoesheroespotatoestomatoesvetoesautoskangarooskilosphotostattoos