Spelling Rules -- Making Noun Plurals - Page 4
Rule 9C: Some plural forms ending in -o end in -os or -oes. Some may use either. See Tables below.
Only -oes
1. echoes 2. embargoes 3. heroes 4. potatoes 5. tomatoes 6. torpedoes 7. vetoes
Either -os or -oes
1. avocados/oes 2. buffaloes/os 3. cargoes/os 4. desperadoes/os 5. dominoes/os 6. ghettos/oes 7. grottoes/os
8. hoboes/os 9. innuendoes/os 10. lassos/oes 11. mangoes/os 12. mosquitoes/os 13.l mottoes/os 14. mulattos/oes
15. noes/os 16. palmettos/oes 17. peccadilloes/os 18. tornadoes/os 19. volcanoes/os 20. zeros/oes  
Rule 10: The plurals of single capital letters, acronyms and Arabic numerals (1, 2, 3,) take an 's' without an apostrophe:
1. Z (the capital letter Z) --- Zs 2. POS (Point Of Sale) --- POSs 3. ATM (Automatic Teller Machine) --- ATMs 4. 7 (the Arabic numeral 7) --- 7s
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