Noun
1. act
2. human action, human activity, activity
3. activeness, state, legal action
4. action at law, proceeding, legal proceeding, proceedings, group action
5. military action
6. group action, natural process
7. natural action, activity, process, plot
8. action mechanism
9. mechanism, drive
10. work
Verb
1. sue
2. litigate, process, challenge, carry through
2. accomplish, execute, carry out, fulfill, fulfil, complete, finish, effect, effectuate, bring about, set up