- nodule - a small node
--1 is a kind of node
- nodule, tubercle - small rounded wartlike protuberance on a plant
--2 is a kind of plant process, enation
- nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)
--3 is a kind of hunk, lump
--3 has particulars: geode - nodule, tubercle - small rounded wartlike protuberance on a plant