Is a P2WPKH address synonymous with a Bech32 address?

Question

BIP142 when encoding a segwit P2WPKH address is using a base58 address format (address p2xtZoXeX5X8BP8JfFhQK2nD3emtjch7UeFm in the example).

I understand that BIP142 predates BIP173 but are P2WPKH and Bech32 synonyms now? Is there such a thing as Base58 P2WPKH address?

Answer 1

are P2WPKH and Bech32 synonyms now?

No. Bech32 is also used for P2WSH addresses. Native segwit and Bech32 are synonyms.

Is there such a thing as Base58 P2WPKH address?

No.