Is an Outboard an Engine or a Motor?

Most call them ‘outboards’, some call them ‘outboard motors’, and a rare few call them ‘outboard engines’, but what are these enigmatic beasts sitting on our transoms?

You can make a case for any or all these names, but which one’s right? We’ll go through some arguments for and against each one, to see if we can come up with a definitive answer!