Same reason the mandible is called the jaw. Different words from earlier languages ended up being part of modern English and meaning the same thing. "Womb" comes from Old English and earlier...
The abdominal cavity.
No, The uterus which is also known as the womb is a hollow, pear-shaped organ located in a woman's lower abdomen, between the bladder and the rectum.
Yes it is.
Yes, they are two words for the same body part.
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