Poṭṭhapādasutta

dn9:52.1 From a cow comes milk, from milk comes curds, from curds come butter, from butter comes ghee, and from ghee comes cream of ghee. And the cream of ghee is said to be the best of these.

dn9:52.2 While it’s milk, it’s not referred to as curds, butter, ghee, or cream of ghee.

dn9:52.3 It’s only referred to as milk.

dn9:52.4 While it’s curd

dn9:52.5 or butter

dn9:52.6 or ghee

dn9:52.7 or cream of ghee, it’s not referred to as anything else,

dn9:52.8 only under its own name.