The term hanger might be derived from the swords hanging on the wall - but probably only in few languages while in other genesis is different.
First difference is that kindjals are always (well there might existing some exceptions maybe?) double-edged, usually straight, blade is quite wide, there is no hilt in European meaning and the grip is open, very often narrowing in the middle.
While most hangers are single-edged, straight or curved, and the grip might be both: open or close. Theye were usually used for hunting from the 16th century, but spread wide from the second half of the 17th century. Most of the hangers we have in collections are 18th century (2nd half) and 19th century, and from the 2nd half the latter we usually get hangers made for foresters. The very typical hanger used to have shell-shape shield at the hilt curved to the blade and partially covered the open of the sheath. You will find also many hunting motifs on the blade and hilt.
Military hangers existed also in some armies but it seems to me that it wasn't very popular weapon.
This is in very short summary

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