Fruit juice and Orange juice

Fruit juice noun - Drink produced by squeezing or crushing fruit.

Orange juice and fruit juice are semantically related. In some cases you can replace phrase "Orange juice" with "Fruit juice", this phrases are similar.

Orange juice noun - Bottled or freshly squeezed juice of oranges.

Fruit juice and orange juice are semantically related. You can use "Fruit juice" instead a noun phrase "Orange juice".