Attendant is a related term of contributing.
As a noun attendant
is one who attends; one who works with or watches something.
As an adjective attendant
is going with; associated; concomitant.
As a verb contributing is
* attendaunt (obsolete)
One who attends; one who works with or watches something.
- Give your keys to the parking attendants and they will park your car for you.
Going with; associated; concomitant.
* Sir Walter Scott
- They promoted him to supervisor, with all the attendant responsibilities and privileges.
(legal) Depending on, or owing duty or service to.
- The natural melancholy attendant upon his situation added to the gloom of the owner of the mansion.
- the widow attendant to the heir
* part and parcel