Root vegetable and Veggie

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

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

Veggie noun - Edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant.

Root vegetable and veggie are semantically related. Sometimes you can replace phrase "Root vegetable" with "Veggie", this terms are similar.