Ionic
Part of speech: adjective
Definition: of, relating to, or containing ions
Particle
Part of speech: noun
Definition: A body with very small size; a fragment.An elementary particle or subatomic particle.A word that has a particular grammatical function but does not obviously belong to any particular part of speech, such as the word to in English infinitives or O as the vocative particle.
Example sentence: In 2002, a Scottish journalist, during a dinner meant to be private, absolutely wanted me to react to Stephen Hawking's comments. I said one shouldn't pay too much attention to what Hawking was saying because he was a celebrity but not a specialist of elementary particle theory.