Alkali and base are not same things but often we think these two as similar thing. They are different from each other in many ways.Some differences are given below:
1_Alkali is a substance that is soluble in water while all bases are not soluble.
2-alkalies are subsets of bases.
3_ All bases contain alkalies but all alkalies don’t contain bases.
4_The example of alkali is NaOH.
5_ The example of base is KOH.