'tar' originates from Old English 'teoru,' which meant 'tar,' and 'related' comes from Latin 'relatus,' meaning 'brought back.'

'tar' changed from Old English 'teoru' to the modern English word 'tar,' while 'related' evolved from Latin 'relatus' to the modern English 'related.'

Initially, 'tar' meant 'a dark, thick, flammable liquid,' and 'related' meant 'connected or associated with.' These meanings have largely remained the same in modern usage.