Prove love exists.
It’s hard to do scientifically as it is the wrong tool to do so.
God is love.
But science can document certain acts and characteristics which evidence altruism, compassion, affection, and indicate positive concern for the welfare of someone or something, and which testifies to said objects of such having value, and thus a name for such is warranted.
However, science can document certain systems of objects and characteristics which evidence power, intelligence as cause, and indicate purpose, which testifies to said objects having value, but no name is allowed for such evident Cause.