Greens and Mixed greens

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

Mixed greens and greens are semantically related In some cases you can use "Mixed greens" instead a noun "Greens".

Greens and mixed greens are semantically related in dish of vegetables topic. You can use "Greens" instead a noun phrase "Mixed greens", if it concerns topics such as garden salad.