The plural form of the noun captain is captains. The plural possessive form is captains'.
Yes, captain is a common noun, a word for any captain of anything.A proper noun is the name of a specific person, place, thing, or a title; for example:Captain Chesley B. "Sully" Sullenberger (US Airways)Captain Cook, HI 96704Captain Strong Elementary School, Battle Ground, WAOld Captain's Inn, Yarmouth Port, MA"Captain Blood", 1935 movie with Errol Flynn and Olivia de Havilland"The Captain", a novel by Seymour Shubin
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
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 echoes. The plural possessive is echoes'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural form is stepsisters. The plural possessive is stepsisters'.
The plural form is inches. The plural possessive is inches'.
The plural possessive of "Father" is, "Fathers"
Studies' is the plural possessive of study.
The plural possessive of bandit is bandits'.