Fruit tree and Mulberry tree

Fruit tree noun - Tree bearing edible fruit.

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

Mulberry tree noun - Any of several trees of the genus Morus having edible fruit that resembles the blackberry.

Fruit tree and mulberry tree are semantically related. You can use "Fruit tree" instead a noun phrase "Mulberry tree".