oil-rich seed(n = noun.plant) oilseed - any of several seeds that yield oil;
is a kind of seed
has particulars: castor bean, cottonseed, candlenut, rapeseed, flaxseed, linseed

amber seed, canary seed, caraway seed, caraway seed bread, celery seed, cola seed, coriander seed, cotton seed, cumin seed, dill seed, edible seed, fennel seed, fenugreek seed, fern seed, gone to seed, jumping seed, mustard seed, neem seed, nicker seed, poppy seed, pumpkin seed, safflower seed, seed, seed beetle, seed cake, seed catalog, seed catalogue, seed coat, seed corn, seed fern, seed grain, seed lac, seed leaf, seed money, seed oyster, seed pearl, seed plant, seed shrimp, seed stock, seed vessel, seed weevil, sesame seed, silkworm seed, sunflower seed, til seed, tilley seed