Words the Bible translates as inward parts

English uses one word here. The Bible uses 2 words, and they do not mean the same thing. Each is listed with what it actually means, most frequent first.

qerevקֶרֶבthe inside of something: its interior, whether a body's organs, a person's hidden self, or the space within a group or place
tuḥahטֻחוֹתsomething covered over and hidden from view, almost certainly a person's inmost being in one of its two biblical uses; what it names in the other use is genuinely unknown

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Every English meaning beginning with I is on its letter page, and the whole index starts at Browse.