The term 'Innermost Part' can be described by three different words: CORE (4 letters), HEART (5 letters), and KERNEL (6 letters). CORE is a word that is used to describe the most essential part of something, such as the CORE of an apple. HEART is a word that is often used to describe the emotional center of a person or thing, such as the HEART of a family. KERNEL is a word that is used to describe the central or innermost part of something, such as the KERNEL of a nut. All three words can be used to describe the innermost part of something, whether it is physical or emotional.