Block

bloco

(substantial often approximately cuboid piece)

bloco

(chemistry: portion of macromolecule)

bloqueio

(something that prevents passing)

quadra

(group of buildings demarcated by streets)

quarteirão

(group of buildings demarcated by streets)

bloquear

(to prevent an action)

bloquear

(to impose a ban from accessing an online service, account or IP address)

impedir

(to prevent an action)