Celery root and Root vegetable

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

Root vegetable and celery root are semantically related. In some cases you can use "Root vegetable" instead a noun phrase "Celery root".

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

Celery root and root vegetable are semantically related. Sometimes you can replace phrase "Celery root" with "Root vegetable", this phrases are similar.