* Writing - This is a noun, referring to the act of putting words on paper or screen.
* Speaking - This is also a noun, referring to the act of using spoken language.
* Two - This is a number, not a noun.
* Forms - This is a noun, referring to different types of something.
* Communication - This is a noun, referring to the exchange of information.
Therefore, there are four nouns in the sentence: writing, speaking, forms, and communication.