Which type of noun's possessive form is created by adding only an apostrophe?

The possessive form of plural nouns is created by adding only an apostrophe if the plural noun already ends in "s." For example, in the case of "dogs," the possessive form is "dogs'." This indicates that something belongs to multiple dogs.

In contrast, singular nouns and collective nouns typically require an apostrophe followed by an "s" to form their possessive. For instance, "cat" becomes "cat's," and "team" becomes "team's."

Abstract nouns can also be singular or plural, but the possessive formation would follow the same rule as singular nouns in that case. Thus, the unique characteristic of plural nouns that already end in "s" differentiates their possessive form, making it simpler, as it only requires the addition of an apostrophe.