Is it haram to call a woman a goddess as a compliment?
Since it does not mean that she literally is a goddess, it is not exactly blasphemy. But it is still not a good thing to say since it borrows pagan imagery, which is not pleasing to God. Rather than thinking of things in terms of halal versus haram only, also think of whether they are pleasing to God or not. The things that are haram are clearly defined and most people know them. But there are many more things that are technically halal but not pleasing to God.
Some can argue it is haram since it contains a pagan meaning. While others will argue it is halal since the intention is not a pagan intention, and the Prophet says, “Acts are [to be judged] by their intentions.” (From Sahih al-Bukhari Book 1, Hadith 1; Sahih Muslim, Book 33, Hadith 222)