1...Say, 'Is "wagon" equal to "car"?' or 'Does "wagon" equal "car"?'
2...No, the two words do not mean the same thing.
Years ago, one commonly saw a kind of car called a "station wagon". It was a long car that could seat more people than a usual car and/or could carry more suitcases, boxes, etc than a usual car could. Station wagons have now been largely replaced by SUVs.