Change my 1st, I'm quite a leaper.
Change my 2nd, I'm something extra.
Change my 3rd, I'm a heavy weapon.
Change my 4th, I differ in color.
What 4-letter word am I?
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MARE
Change my 1st, I'm quite a leaper.
HARE, a rabbit
Change my 2nd, I'm something extra.
MORE
Change my 3rd, I'm a heavy weapon.
MACE, a heavy metal club
Change my 4th, I differ in color.
MARK, a spot or line on a surface, visible through difference in color or elevation from that of the surrounding area. Definition from link at Dictionary.com
You are
MARE
Change my 1st, I'm quite a leaper.
HARE
Change my 2nd, I'm something extra.
MORE
Change my 3rd, I'm a heavy weapon.
MACE
Change my 4th, I differ in color.
MARS