I have a little confusion about naming in Bitcoin.

Redeem script is the conditions that will be satisfy. For example P2PKH inside P2SH

OP_DUP OP_HASH160 <PubKHash> OP_EQUALVERIFY OP_CHECKSIG == redeem script

In P2SH-P2WPKH the redeem script is:

The P2SH redeemScript is always 22 bytes. It starts with a OP_0, followed by a canonical push of the keyhash (i.e. 0x0014{20-byte keyhash}).

Sometime It call script hash, and during the transaction I need to insert the redeem script in witnessScript. "witnessScript": "hex", (string) (required for P2WSH or P2SH-P2WSH) witness script

Then the redeem script in segwit environment is called redeem script, script hash or witness script?

Witness program

A scriptPubKey (or redeemScript as defined in BIP16/P2SH) that consists of a 1-byte push opcode (for 0 to 16) followed by a data push between 2 and 40 bytes gets a new special meaning.

Witness program depends on script could be scriptPubkey or redeem script?