In England the word WAGE is linked with unskilled/factory workers being paid weekly or monthly. Professionals such as doctors, engineers and managers nearly always talk in terms of an annual SALARY. This is a gross oversimplification, I know! Of course you can break an annual salary down, and then quote what you get each week! And of course you can multiply your weekly wage up, and say what you get a year. So I KNOW they are often interchangeable. However, I've never heard a doctor mention anything about 'wages' and I rarely hear agricultural labourers using the word 'salary' (even if they are on a yearly contract).

A salary is a fixed amount of money you earn per week, month or year. For example, if you make $25,000 per year, and one day you stay 2 hours late to get some extra work done, you are unlikely to get paid for your overtime. Your salary is $25,000, so that's all you get. A wage is something earned per hour, based entirely on the amount of time you worked. For example, I am an hourly-wage employee. If I work 40 hours this week (which is full time), then I get paid for 40 hours. If I work 50 hours, I get paid more. If I work 32 hours, I get paid less. My wage reflects the number of hours worked. Laborage is not a word, but labour is (spelled labor in the USA). Labour just means work. If you work with your body (on a farm), that is labour. If you work with your mind, say, in an office, that is still labour. A woman having a baby is not getting paid, but she is still doing very hard work to bring her baby into the world, so we call that labour as well. Labour is both paid and unpaid work. I hope this helps.