The plurals of most nouns ending in an o that's preceded by a consonant are formed by adding es.
potato - potatoes
embargo - embargoesException: All musical terms ending in an o form plurals by adding only an s.
soprano - sopranos
duo - duos
piano - pianos
Other exceptions include memos and nouns ending in o that can form plurals by adding either s or es, such as mementos/mementoes and cargos/cargoes.
(From Write for Business, page 209, and Proofreader's Guide PDF, page 21)
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