Bramble bush and Raspberry bush

Bramble bush noun - Any prickly shrub of the genus Rubus bearing edible aggregate fruits.

Raspberry bush and bramble bush are semantically related. In some cases you can replace phrase "Raspberry bush" with "Bramble bush", this phrases are similar.

Raspberry bush noun - Woody brambles bearing usually red but sometimes black or yellow fruits that separate from the receptacle when ripe and are rounder and smaller than blackberries.

Bramble bush and raspberry bush are semantically related. You can use "Bramble bush" instead a noun phrase "Raspberry bush".