Noun Gender
Many common nouns, like "engineer" or "teacher," can refer to men or women. Once, many English nouns would change form depending on their gender -- for example, a man was called an "author" while a woman was called an "authoress" -- but this use of gender-specific nouns is very rare today. Those that are still used occasionally tend to refer to occupational categories, as in the following sentences.
David Garrick was a very prominent eighteenth-century actor.
Sarah Siddons was at the height of her career as an actress in the 1780s.
The manager was trying to write a want ad, but he couldn't decide whether he was advertising for a "waiter" or a "waitress"