Postponement vs Deferment - What's the difference?

As nouns the difference between postponement and deferment

is that postponement is a delay, as a formal delay in a proceeding while deferment is an act or instance of deferring or putting off.

(postponements)

A delay, as a formal delay in a proceeding.

:The lawyer asked for a postponement in the trial so he could spend more time preparing before it began.

(en noun)

An act or instance of deferring or putting off.

Officially sanctioned postponement of compulsory military service.

* deferral