As nouns the difference between realisation and act
is that realisation is making; creation; realization while act is (countable) something done, a deed.
As a verb act is
to do something.
act
English
Noun
(
en noun)
A certain standardized college admissions test in the United States, originally called the (term).
*
Coordinate terms
* (American College Test) SAT , GMAT , MCAT , DAT