Nutmace is a spice. They have nutty, warm and slightly sweet flavour in its natural states. They are part of indian garam masala. Mace is a lighter colour and can be used in light coloured dishes
Cardamom has a strong, unique taste, with an intensely aromatic, resinous fragrance. Black cardamom has a distinctly more smoky, though not bitter, aroma, with a coolness some consider similar to mint.