Is there anything I can substitute almond butter with?

Depends on what you're making. In baked goods, hazelnut butter can be substitued and also has good flavour. Tahini (sesame butter) also a good choice. Pumkin seed butter is also a good sub in savoury items and adds a gentle green tinge.

BUT!!!...if you're trying to make a recipe "safe" for a nut allergy sufferer, I would speak to them first to be sure what they can and cannot eat. Some nut allergy sufferers are also sensitive to things like sesame - better safe than sorry!

Depends what you are using if for.. Any nut butter will be similar.

What's the application? Depends on what your using it for ...

I think any nut butter should do the trick.

peanut butter is maybe too obvious...? What's your need?

Sunflower butter?