Substitute for cumin?

Paprika

You can use ground cumin in place of cumin seed. Beyond that, there is not another spice or herb that would give a similar flavor.

Maybe coriandor?

Both are a very specific flavor so the dish won't taste the same if you substitute but you could try coriander for cumin. Hot paprika might be used for chili powder.

A substitute is a person or thing that takes the place or function of another. In cooking, it would be an ingredient which can replace another. For example, if you are baking cookies and your recipe...