Difference between caustic soda and caustic potash

[WMDhamnekar]

I read the chemical formula for Potassium Hydroxide (Caustic soda)=NaOH (1)I also read the chemical formula for caustic potash having same chemical name Potassium Hydroxide =KOH.

I want to know what is the difference between these two chemical compounds in terms atoms, molecules, ions? Why the name of (1) is not Sodium Hydroxide as it contains sodium(Na)?

 

[I like Serena]

It looks like a typo in your book. The name of $\ce{NaOH}$ is indeed Sodium Hydroxide, also known as lye and caustic soda.