Synonyms: atom, speck, particle, molecule, mote, corpuscle
Definition: (nontechnical usage) a tiny piece of anything
Similar words: material, stuff
Definition: the tangible substance that goes into the makeup of a physical object
Usage: coal is a hard black material; wheat is the stuff they use to make bread
Synonyms: molecule
Definition: (physics and chemistry) the simplest structural unit of an element or compound
Similar words: unit, building block
Definition: a single undivided natural thing occurring in the composition of something else
Usage: units of nucleic acids