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's (EN)
suffix, pronoun

This word can also be a form of:
be (auxiliary verb, verb)
have (auxiliary verb)

suffix “'s”

's
  1. indicates possession (or association, belonging to or associated with someone or something)
    The cat's whiskers were twitching as it hunted.

pronoun “'s”

's
  1. shortened form of "us" used in the phrase "let's" to suggest an action for a group to do together
    It is getting late, let's head home.