According to https://en.wikipedia.org/wiki/Greek_words_for_love ἀγάπη, among other things, refers to
Agape is used in ancient texts to denote feelings for one's children and the feelings for a spouse
while στοργή is explained like this:
Storge means "love, affection" and "especially of parents and children". It is the common or natural empathy, like that felt by parents for offspring.
Sounds very similar (other meanings of the words are different). That these words share this meaning kind of contradicts the main point of this article
Ancient Greek philosophy differentiates at least four main conceptual forms and distinct words for the Modern English word love