Celeriac and Root vegetable

Celeriac noun - Thickened edible aromatic root of a variety of celery plant.

Root vegetable and celeriac are semantically related. In some cases you can use "Root vegetable" instead a noun "Celeriac".

Root vegetable noun - Any of various fleshy edible underground roots or tubers.

Celeriac and root vegetable are semantically related. Sometimes you can replace term "Celeriac" with "Root vegetable", this terms are similar.