What are bases that are soluble in water called?

Bases that can completely dissolve in water are specifically called alkalis.
* All alkalis are bases, but all bases are not alkalis (as some bases do not dissolve in water).
* Examples of alkalis include Sodium Hydroxide ($\text{NaOH}$) and Potassium Hydroxide ($\text{KOH}$).
* They turn red litmus paper blue and have a bitter taste and soapy feel.