What has the word acid in its name, but it is not acid?

Both oxyacid salts and acidic oxyacid salts have acids in their names, but they are not acids.

For example, oxyacid salts: sodium nitrate, sodium sulfate, calcium carbonate, etc. They all contain acid, but they are all salt.

Another example is acidic oxyacid salts: sodium bisulfate, sodium bicarbonate, etc. It also contains acid, but it is all salt.