S: (n) issuer (an institution that issues something (securities or publications or currency etc.))
S: (n) charity (an institution set up to provide help to the needy)
S: (n) company (an institution created to conduct business) "he only invests in large well-established companies"; "he started the company in his garage"
S: (n) religion, faith, organized religion (an institution to express belief in a divine power) "he was raised in the Baptist religion"; "a member of his own faith contradicted him"