screwworm

As nouns the difference between maggot and screwworm

is that maggot is a soft, legless larva of a fly or other dipterous insect, that often eats decomposing organic matter while screwworm is the larva of the fly (old world screwworm) the larva can be parasitic in humans and animals and are distinctive in eating living flesh of mammals unlike most maggots which eat only dead flesh.

As nouns the difference between screwworm and woodworm

is that screwworm is the larva of the fly species: Cochliomyia hominivorax (New World screwworm) or species: Chrysomya bezziana (Old World screwworm). The larva can be parasitic in humans and animals and are distinctive in eating living flesh of mammals unlike most maggots which eat only dead flesh while woodworm is any of many beetle larvae that bore into wood.