The phrase "soft part" refers to any part of an object or organism that is delicate or easily damaged. There are several synonyms for this term that can be used to describe different types of soft parts. For example, the word "fleshy" might be used to describe soft parts of an animal or plant that are plump and full. "Tender" could be used to describe areas of an object or organism that require careful handling. "Spongy" is a good choice for describing materials that are soft, porous, and easily compressed. Other possible synonyms for "soft part" include "delicate," "yielding," "gentle," and "fragile".