Zoophyte

[Zipporah Schumaker]

Any one of numerous species of invertebrate animals
which more or less resemble plants in appearance, or mode of growth, as
the corals, gorgonians, sea anemones, hydroids, bryozoans, sponges,
etc., especially any of those that form compound colonies having a
branched or treelike form, as many corals and hydroids.

[Becky]

[in between] [a plant] and an [animal].

[Thomassew]

any of various invertebrate animals resembling a plant such as a sea anemone or coral or sponge