particle

nouns

(nontechnical usage) a tiny piece of anything
atom, corpuscle, molecule, mote, particle, speck
a body having finite mass and internal structure but negligible dimensions
particle, subatomic particle
a function word that can be used in English to form phrasal verbs
particle
is a type of (narrower)
a word that is uninflected and serves a grammatical function but has little identifiable meaning
closed-class word, function word