adjective
BAD : Beauvais is very proud of having the highest cathedral in Europe.
GOOD : Beauvais is very proud of having the tallest cathedral in Europe.
BAD : Smoke pours out of the high chimneys all day long.
GOOD : Smoke pours out of the tall chimneys all day long
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Use high to describe something that is a long way above the ground (or whose top is a long way above the ground): 'The rooms on the ground floor have very high ceilings.' 'The top shelf was too high for me to reach.' 'The high wall made it impossible for prisoners to escape.'
Use tall (NOT high ) to describe people, animals, trees, plants and things which are narrow and above average height: 'Most of the tall trees had been cut down.' 'I'd like to marry someone tall with a sense of humour.' 'He's almost six feet tall.'