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- Sheep: The word 'sheep' is the same in both singular and plural forms.
- Deer: The plural of 'deer' is still 'deer'.
- Fish: Although 'fishes' can be used, 'fish' is more commonly used for both singular and plural.
- Species: This noun has the same singular and plural form.
- Aircraft: The plural of 'aircraft' is still 'aircraft'.
- Swine: The plural of 'swine' is 'swine' as well.
- Moose: The plural of 'moose' remains 'moose'.
- Salmon: The plural of 'salmon' is still 'salmon'.
- Shrimp: The plural of 'shrimp' is both 'shrimps' and 'shrimp'.
- Plankton: The plural of 'plankton' remains 'plankton'.
- Headquarters: The word 'headquarters' is used for both singular and plural instances.
- News: Even though 'news' ends with '-s', it's usually a singular noun.
- Scissors: This word is always used in plural form even for a single item because it has two parts.
- Pliers: Similar to 'scissors', 'pliers' is also typically used in its plural form.
- Shorts: This item of clothing is said as 'shorts' in both singular and plural.
- Barracks: The plural of 'barracks' is 'barracks'.
- Luggage: This noun doesn't have a plural form, it always remains 'luggage'.
- Measles: This disease's name has '-s' at the end but it's a singular noun.
- Mumps: Similar to 'measles', 'mumps' is also a singular noun.
- Alms: The plural of 'alms' is 'alms'.
- Species: The plural of 'species' is 'species'.
- Offspring: The plural of 'offspring' is 'offspring'.
- Series: The plural of 'series' remains 'series'.
- Chassis: The plural of 'chassis' is 'chassis'.
- Trout: The plural of 'trout' is 'trout'.
- Tuna: The plural of 'tuna' is 'tuna'.
- Squid: The plural of 'squid' can be 'squid' or 'squids'.
- Bison: The plural of 'bison' is 'bison'.
- Buffalo: The plural of 'buffalo' can be 'buffalo' or 'buffaloes'.
- Dwarf: The plural of 'dwarf' can be 'dwarfs' or 'dwarves'.
- Elf: The plural of 'elf' can be 'elfs' or 'elves'.
- Quiz: The plural of 'quiz' is 'quizzes'.
- Bus: The plural of 'bus' is 'buses'.
- Box: The plural of 'box' is 'boxes'.
- Matrix: The plural of 'matrix' is 'matrices'.
- Index: The plural of 'index' is 'indices' or 'indexes'.
- Basis: The plural of 'basis' is 'bases'.
- Kiss: The plural of 'kiss' is 'kisses'.
- Wish: The plural of 'wish' is 'wishes'.
- Foot: The plural of 'foot' is 'feet'.
- Tooth: The plural of 'tooth' is 'teeth'.
- Mouse: The plural of 'mouse' is 'mice'.
- Goose: The plural of 'goose' is 'geese'.
- Child: The plural of 'child' is 'children'.
- Man: The plural of 'man' is 'men'.
- Woman: The plural of 'woman' is 'women'.
- Cactus: The plural of 'cactus' can be 'cactuses' or 'cacti'.
- Octopus: The plural of 'octopus' can be 'octopuses' or 'octopi'.
- Radix: The plural of 'radix' is 'radices'.
- Crisis: The plural of 'crisis' is 'crises'.
