Leafy vegetable and Spinach

Leafy vegetable noun - Any of various leafy plants or their leaves and stems eaten as vegetables.

Spinach and leafy vegetable are semantically related. In some cases you can replace term "Spinach" with "Leafy vegetable", this terms are similar.

Spinach noun - Dark green leaves; eaten cooked or raw in salads.

Leafy vegetable and spinach are semantically related. Sometimes you can use "Leafy vegetable" instead a noun "Spinach".