Question

all alkalies are base but all base are not alkalies justify this statement

Answer 1

Alkalies are soluble bases. That is soluble or dissolve in water. Only solubel bases are categorized into alkalies.
Therefore all alkalies (soluble bases) are bases but not all bases are alkalies (soluble bases).

Answer 2

because the bases which are soluble in water are called alkalis


example KOH,NaOH