ATOM
Particle
Authority can be used as another word for expert and starts with an "A". Example: An authority on the subject of crime, notes that...
tiny, teeny, small, minuscule
precise
BinomialBisectorBrackets One word can be "binomial". Another word can be" bracket[s]"
no
tiny village
Itty
It's a word that means a very small piece or part of something; a tiny portion or a speck.
Car is another word for truck that starts with a "c".
I think it would be a particle
particle
Tiny
Iota.
Another word for addition which starts with the letter N is New.
A person or thing that is very small and tiny.
Particle