types:
adjunct
a person who is an assistant or subordinate to another
affiliate
a subordinate or subsidiary associate; a person who is affiliated with another or with an organization
ally,
friend
an associate who provides cooperation or assistance
fellow member,
member
one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
shipmate
an associate on the same ship with you
stakeholder
a person who has an interest or share in something, especially a business
comrade
someone with whom one has endured a dangerous situation, especially a fellow soldier
Areopagite
a member of the council of the Areopagus
blood brother
a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
bride
a woman participant in her own marriage ceremony
bridge partner
one of a pair of bridge players who are on the same side of the game
brother
a male person who is a fellow member (of a fraternity or religion or other group)
charter member
one of the original members when an organization was founded
fellow
a member of a learned society
homeboy
a fellow male member of a youth gang
homegirl
a fellow female member of a youth gang
inductee
a person inducted into an organization or social group
joiner
a person who likes to join groups
partaker,
sharer
someone who has or gives or receives a part or a share
player
an important participant (as in a business deal)
pledge
someone accepted for membership but not yet fully admitted to the group
Rosicrucian
a member of a secret 17th-century society of philosophers and scholars versed in mystical and metaphysical and alchemical lore
Rosicrucian
a member of any of various organizations that subsequently derived from the 17th-century society
sister
a female person who is a fellow member of a sorority or labor union or other group