is a specific kind of: fungus.

is a broader term that covers: covered smut | loose smut | corn smut, cornsmut | genus Sphacelotheca, Sphacelotheca | head smut, Sphacelotheca reiliana | bunt, Tilletia caries | bunt, stinking smut, Tilletia foetida | onion smut, Urocystis cepulae | flag smut fungus.

is a member of: order Ustilaginales, Ustilaginales.

derivation: smut | smut.