Two definitions for two different words will be given. These words will differ only by their vowels. To change a word, both adding a vowel and changing a vowel is allowed, as long as the consonants are the same and in the same order. For example, bust to beast can be an answer.
1. A sticky product of trees to a type of dried fruit 2. A black bird to a chasm 3. Round object to a fee 4. Part of the body below the leg to a great achievement