WordNet sense 1 (spend time in prison or in a labor camp):

do, do

WordNet sense 2 (be sufficient; be adequate, either in quality or quantity):

answer, suffice

WordNet sense 3 (be used by; as of a utility):

service

WordNet sense 4 (work for or be a servant to):

assist, attend, attend to, wait on

WordNet sense 5 (serve a purpose, role, or function):

function

WordNet sense 6 (promote, benefit, or be useful or beneficial to):

serve well

WordNet sense 7 (deliver a warrant or summons to someone):

process, process, swear out

WordNet sense 8 (help to some food; help with food or drink):

help

WordNet sense 9 (provide (usually but not necessarily food)):

dish, dish up, serve up, dish out