is the "concept" of love. is the physical emotion that humans feel. be can added to other things in a similar way:
> []{} Emotion(s)
>
> []{} Friendship
>
> []{} Passion (lit. "emotional heat")
>
> []{} (He has) no compassion/sympathy for others.
See a pattern?
The broader issue for you here (which I've seen from some of your other posts as well) is that it seems you want a clean one-to-one mapping between English words and Japanese words/Kanji. It's very natural to want this, and we all feel your pain. Unfortunately that's not the way it works.
Words are just labels for ideas/concepts we have in our heads. Some words point to the same ideas, some single words point to multiple ideas. Sometimes we don't have a label for a concept that exists in another culture, and vise versa. It's something like this:
![enter image description here](
This is just how languages work. For now, just keep learning, and keep asking questions.