As a noun milk
is (uncountable) a white liquid produced by the mammary glands of female mammals to nourish their young from certain animals, especially cows, it is a common food for humans as a beverage or used to produce various dairy products such as butter, cheese, and yogurt.
As a verb milk
is to express milk from (a mammal, especially a cow).
As a proper noun axel is
in quiet use since the 19th century.