The possessive form for the noun eagle is eagle's.
Example: An eagle's nest could be seen on a high ridge.
The noun "eagle" is neither possessive nor plural; it is simply a singular common noun.
The singular possessive form is eagle's.
The plural form of the noun eagle is eagles.
The plural possessive form is eagles'.
The word eagles is the plural form for the singular noun eagle.
The plural form for the noun eagle is eagles.
The plural possessive form is eagles'.
Example: The eagles' nest was used by the same pair each year.
eagle's
singular possessive of "eagle": eagle's plural possessive of "eagle": eagles'
Eagle's is the possessive form of the noun eagle meaning something belonging to the eagle like the eagle's wings or the eagle's tail while eagles is the plural possessive form of the noun like all of the eagles' wings are brown.
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural possessive of stepsister is stepsisters'.
The plural form is echoes. The plural possessive is echoes'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural possessive is pals'.
The plural possessive of bandit is bandits'.
Studies' is the plural possessive of study.