flag: distinctive image used as a symbol, traditionally embodied as a piece of fabric

Amazon rainforest: large rainforest in South America

group of humans: any set of human beings

road transport: collective term for all forms of transport which takes place on roads, or (ground) surface, except railroads

worker: person who works

tram: public transport vehicle running on rails predominantly located on streets

railroad car: vehicle used for carrying cargo or passengers on rail transport system