Molecule
1. Molecule, Atom, Corpuscle, Mote, Particle, Speck : ریزہ - ذرہ : (Noun) (nontechnical usage) a tiny piece of anything.
Grain - a relatively small granular particle of a substance.
Piece - ٹکڑا - a separate part of a whole; "an important piece of the evidence".
Bantam, Diminutive, Flyspeck, Lilliputian, Midget, Petite, Tiny - ننھا - very small; "diminutive in stature".
Custom, Usage, Usance - رسم - accepted or habitual practice.