It is an addend or subtrahend. However, almost nobody who studies mathematics seriously uses these terms.
Yes.
I'm not 100% certain I understand what you are asking, but each number in an equation is most generically called a "term," while the actual "+" or "-" symbol is called the "operator".
Each part of an equation or an expression is called a term.
An algebraic term.
It is a term.
Not really. A term is a part of an expression.
You convert an (infix) expression into a postfix expression as part of the process of generating code to evaluate that expression.
ite added to the end of a word is called a suffix. It creates a noun.
NO
Component... Hardware.... CPU.... Memory...
They are terms of an algebraic expression
Expression is a noun.