is a specific kind of: natural object.

is a broader term that covers: stub | button | thallus | cap, pileus | calyptra | volva | domatium | pycnidium | stipule | tepal | gynostegium | chalaza | nucellus | germ tube | pollen tube | mentum | corona | lip | mycelium | plant organ | aril | duct | veil, velum | annulus, skirt | plant tissue | tendril | stump, tree stump | prophyll | stock | receptacle | kernel, meat | lobe | ligule ... show more.

is a part of: flora, plant, plant life.