There is no word spelled love in the dragon language. One close spelling is luv, which means 'teardrop'. For draconic translations of the English word 'love', look here.

Ruvgein, a user on here, recently created a wonderful thread about ways to express "love" in Dovahzul. I've utilized it a few times already, and it should be quite helpful with your question! You can find the thread here.

Long story short, depends on what kind of love you mean. This guide serves as a good disambiguation for the many uses of the word and how best to express them in Dovahzul.