fall over/ down and lean over/ forward

0Dear teachers02br
00Can I tell me the differences between02br
01i00A. fall over and fall down02i02br
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01i00fall down02i00: 01b00to suddenly go down onto the ground after you have been standing, walking, or running, especially without intending to: 02b02br
00Ex:Lizzie fell down and hurt her knee.02br
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01i00 fall over02i00:01b00to fall onto the ground or to fall from an upright position02b02br
00Ex:Tommy fell over and cut his knee badly.02br
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00I don't see any difference between them. Can I say, "Lizzie fell over and hurt her knee." and "Tommy fell down and cut his knee badly?"02br
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01i00B. lean over and lean forward02i02br
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00Ex. They were leaning forward, facing each other. Can I say,"They were leaning over, facing each other?"02br
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00Thanks for your detailed explanation0-