What does the senator do?
Err...one is for the military and one works for the government? A major is just a rank that you get when in the military. A senator is an elected official that works at the Senate. Like a representative, a senator votes on bills. if they pass both the Senate and the House of Representatives, it goes to the President. If he signs it, it becomes a federal law.
A senator is a person who represents the region they were elected in Pretty much they vote on bills, laws, foreign policy and also try to make what they want to pass to pass
A 'major' is a rank in the military. A 'senator' is a member of a civilian legislative body (state or federal). You can't really compare them. Sorry.
one is army and other is a politician