Here's what I have come up with.
What I understand is that implicature is always indirect and not explicit, so the hearer must infer from the context. Speech act, on the other hand, may be direct and explicit Ex. Use imperative form to command and or with performative verb ex. I command you...
Is this correct?
Also, implicature can be Cancelled or reinforced, and it is indeterminate. But is speech act also cancellable?