Collocations for initiate - verb

formally
The investigation was formally initiated last month.

immediately
recently

Initiate is used with these nouns as the object:
action, breakup, campaign, change, contact, conversation, courtship, development, discussion, divorce, effort, enquiry, investigation, legislation, litigation, move, movement, offence, phase, proceedings, process, programme, project, prosecution, reaction, reform, scheme, search, talk