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Spelling Rules -- Making Noun Plurals - Page 3
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Rule 9:
The plurals of words ending in -o can be formed by adding either -s or
-es. Many words can be formed either way. You need to check a dictionary. Three
helpful rules with a table can help.
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Rule 9A:
All words that end in a vowel plus an -o (-ao, -eo, -io, -oo, -uo) have
plurals that ends in just -s.
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1. studio --- studios
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2. duo --- duos
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3. trio --- trios
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4. stereo --- stereos
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5. tattoo --- tattoos
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Rule 9B:
All musical terms ending in -o have plurals in just -s.
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1. piano --- pianos
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2. cello --- cellos
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3. solo --- solos
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4. banjo --- banjos
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5. alto --- altos
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6. soprono --- sopranos
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Rule 9C:
Some plural forms ending in -o end in -os or -oes. Some may use either. See
Tables below.
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Only -os
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1. albinos
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2. armadillos
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3. autos
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4. bravos
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5. broncos
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6. casinos
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7. combos
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8. gazebos
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9. infernos
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10. kimonos
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11. logos
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12. maraschinos
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13. ponchos
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14. sombreros
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15. tacos
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16. torsos
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17. tobaccos
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18. typos
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