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@sundogplanets
Here in UK, the common term is an articulated lorry (or sometimes articulated truck), ‘artic’ for short. Most people probably don’t distinguish a separate term for the two parts, but ‘tractor’ and ‘trailer’ can be used. The front part is definitely not commonly called a truck, that term usually means an SUV-sized vehicle which Americans call a pickup. At least that’s my usage, others may vary.