noun (n)

• equipment consisting of miscellaneous articles needed for a particular operation or sport etc.(noun.artifact)

  Synonym:
  gear, paraphernalia
  

  source: wordnet30
• a supplementary component that improves capability(noun.artifact)

  Synonym:
  accessory, add-on, supplement
  

  source: wordnet30
• That which belongs to something else; an adjunct; an appendage; an accessory; something annexed to another thing more worthy; in common parlance and legal acceptation, something belonging to another thing as principal, and which passes as incident to it, as a right of way, or other easement to land; a right of common to pasture, an outhouse, barn, garden, or orchard, to a house or messuage. In a strict legal sense, land can never pass as an appurtenance to land.(noun)

  source: webster1913