Realization

Among all the words mentioned earlier, realize is unique. Realize is to 'make real'
Realize is used intechangeably with understand sometimes but the difference between 'realize' and 'understand' is that understanding is an unattached comprehension by the mind, without real significance. It is 'comprehension without taking 'reality' into account.And realization is wherein is the understanding is due to experience with awareness( it is within reality and not within the constructs of the mind )

The self cannot be observed,understood or perceived.Whenever a attempt is made to observe the self, there is a distortion in the observation or perception from reality.

The self can therefore be understood only in reality by 'Realization'

Realization is the only experience (with awareness) wherein the observer and observed are one and the same (unity in infinity).