The word fish.
That is actually debatable. Though you can use "fish" for both the singular and plural forms, "fishes" is not incorrect. But words that do not change in plural applications and are NOT debatable are "deer" and "moose".
Let's clarify a bit. Fish AND fishes are correct. Let me explain. You might say "I have one fish in my aquarium." or "I have two fish in my aquarium." So, when would you use "fishes"? You would use that term to describe the different types in the oceans. You would say "Of all the fishes in the ocean, the Blue Whale smells the best." If you had used "Of all the fish in the ocean, the Blue Whale smells the best.", you would be implying there was only one Blue Whale whereas in the first example, you are saying that of all species of fish, the species of Blue Whale smell the best.
The same can be said for "People" and "Peoples". "Of all the peoples in the world, the Eskimos are the coolest."
And for the record, I'm not sure the blue Whale smells any better than any other fish.
I think you are looking for nouns that don't form the plural by adding an "s" on the end. Here are a few plurals:
The plural form for a nouns that ends with -nx, such as sphinx, the plural form is sphinxes; add -es after the -nx.
The word tortoise forms a regular plural, tortoises.
The word your can be both plural and singular. You may say to one person, "Is that your car?" You would also say to a group of people "Are those your cars?" Either way, the form of your does not change. The word "yours" is not a plural. It is the possessive form of your.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
the plural word is comedones
The word changes from singular to plural by adding an "s" at the end of the word.
The plural form of "tongue" is "tongues."
To form the plural of a word, typically add "s" or "es" to the end of the word. However, there are irregular plural forms where the word changes entirely (e.g. child to children). Use a dictionary or grammar guide for exceptions.
the plural form of music is ........... music there is no physical change to the word
horse
The third person plural pronoun is they. So if we start with the first person singular pronoun I, and change it to they, we have performed the change that you have requested.
The plural form for a nouns that ends with -nx, such as sphinx, the plural form is sphinxes; add -es after the -nx.
The word tortoise forms a regular plural, tortoises.
The word your can be both plural and singular. You may say to one person, "Is that your car?" You would also say to a group of people "Are those your cars?" Either way, the form of your does not change. The word "yours" is not a plural. It is the possessive form of your.
The plural form of "sheep" remains "sheep" as there is no change in its spelling when pluralized.
Frosty, you do not change it.
The word peoples is an incorrect form. The noun people is the plural form without adding the s at the end.The singular possessive form is person's.The plural possessive form is people's.example: You can't change other people's attitude, but you can change your own.