Term: zero hour: the time set for the start of an action or operation
Broader: hour: clock time | Unrelated: gymnospermous tree: any tree of the division Gymnospermophyta
Broader: hour: clock time | Unrelated: combination plane: a woodworking plane that has interchangeable cutters of various shapes
Broader: hour: clock time | Unrelated: mushroom: a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb)
Broader: hour: clock time | Unrelated: flintstone: pebbles of flint used in masonry construction
Broader: hour: clock time | Unrelated: vacuolization: the state of having become filled with vacuoles
Broader: hour: clock time | Unrelated: exposition: (music) the section of a movement (especially in sonata form) where the major musical themes first occur
Broader: hour: clock time | Unrelated: pull-off: designated paved area beside a main road where cars can stop temporarily
Broader: hour: clock time | Unrelated: format: the general appearance of a publication
Broader: hour: clock time | Unrelated: anime: any of various resins or oleoresins
Broader: hour: clock time | Unrelated: anticholinergic: a substance that opposes or blocks the action of acetylcholine