holozoic

As a noun heterotroph

is (ecology) an organism which requires an external supply of energy in the form of food as it cannot synthesize its own.

As an adjective holozoic is

obtaining nutrition, as most animals, by the ingestion of organic matter.

As adjectives the difference between holozoic and hylozoic

is that holozoic is obtaining nutrition, as most animals, by the ingestion of organic matter while hylozoic is of or pertaining to hylozoism.