1.  appurtenance(n = noun.artifact) gear, paraphernalia - equipment consisting of miscellaneous articles needed for a particular operation or sport etc.;
is a kind of equipment
has particulars: fishing gear, fishing rig, fishing tackle, rig, tackle, kit, outfit, regalia, rig, rigging, tackle, saddlery, stable gear, tack

2.  appurtenance(n = noun.artifact) accessory, add-on, supplement - a supplementary component that improves capability;
is a kind of component, constituent, element
has particulars: auto accessory, computer accessory, fitting, fixings, trimmings
Derived forms verb appertain₁, adjective appurtenant₁

   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. Tomlins. Bouvier. Burrill. [1913 Webster]
"Globes . . . provided as appurtenances to astronomy." [1913 Webster]
"The structure of the eye, and of its appurtenances." [1913 Webster]

appurtenance, n. (usu. in pl.) a belonging; an appendage; an accessory.

Etymology:
ME f. AF apurtenaunce, OF apertenance (as APPERTAIN, -ANCE)

N  component, component part, integral part, integrant part, element, constituent, ingredient, leaven, part and parcel, contents, appurtenance, feature, member, personnel, forming, inclusive.

N  accompaniment, adjunct, context, appendage, appurtenance, coexistence, concomitance, company, association, companionship, partnership, copartnership, coefficiency, concomitant, accessory, coefficient, companion, buddy, attendant, fellow, associate, friend, colleague, consort, spouse, mate, partner, co-partner, satellite, hanger on, fellow-traveller, shadow, escort, cortege, attribute, accompanying, concomitant, fellow, twin, joint, associated with, coupled with, accessory, attendant, obbligato, with, withal, together with, along with, in company with, hand in hand, side by side, cheek by jowl, cheek by jole, arm in arm, therewith, herewith, and, together, in a body, collectively, noscitur a sociis, virtutis fortuna comes.