Synonyms for Watch over:

n.

govern, head, control, lead, command, run, supervise, manage.

v.

chaperon (verb)
supervise.
keep (verb)
manage, run, command.
manage (verb)
head, govern.
tend (verb)
control.

Other synonyms:

manage, supervise, govern. control, command. look after, head. guard. run, lead.