Is this term an irregular noun wherein the singular form is also the plural form, or the plural form follows some odd rule?

An irregular noun does not follow the standard rules for pluralization.

Noun pluralization rules

nouns that end in...

  1. Most nouns add s to the end.
    cat – cats;
    car – cars;
    team – teams
  2. ch, sh, s, x, or z  where es  is added to the end
    church – churches;
    tax ­­­­– taxes;
    pass – passes 
  3. or fe   where the f or fe becomes ves where  s is added to the end
    elf – elves; 
    loaf – loaves; 
    thief – thieves
  4. vowel and y where s is added to the end
    toy – toys;
    boy – boys;
    employ – employs
  5. vowel and o add s to the end
    video – videos;
    studio – studios;
    zoo – zoos
  6. consonant and y where y becomes ies
    baby – babies;
    country – countries;
    spy – spies
  7. consonant and o where es is added to the end
    hero – heroes;
    potato – potatoes;
    volcano – volcanoes 
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