Usage patterns
〈場所〉に訪問者が来るa visitor comes to a place
A visitor came to the office, so I attended to them.
訪問者を迎えるto welcome a visitor
We prepared at the reception desk to welcome visitors.
訪問者の数が〈動詞〉the number of visitors (increases, decreases, etc.)
The number of visitors to this website suddenly increased.
訪問者名簿に記入するto sign the visitor register
Please sign the visitor register before entering the building.