oil seed
Technical term for seeds cultivated primarily for their oil content, such as rapeseed, sunflower seeds, or sesame seeds.
Rapeseed is one of the typical oil seeds.
油糧種子 is a near-synonym also meaning 'oil seed', but 脂肪種子 emphasizes the fat/oil content while 油糧種子 stresses the use as a raw material for oil production.
Compound of 脂肪 (しぼう, 'fat, oil') and 種子 (しゅし, 'seed').