九穀[kyuukoku] the nine grains
五穀[gokoku] the 5 grains (wheat, rice, beans, millet (awa and kibi))
穀食[kokushoku] cereal diet
穀倉[kokusou] granary
穀物[kokumotsu] grain

穀粉[kokufun] grain (rice) flour
穀粒[kokuryuu] kernel
穀類[kokurui] grains
脱穀[dakkoku] threshing (e.g. rice)
脱穀機[dakkokuki] threshing machine

パン粉[panko] breadcrumbs
メリケン粉[merikenko] (wheat) flour
黄な粉[kinako] soy flour
加糖粉乳[katoufunnyuu] sweetened powdered milk
火の粉[hinoko] sparks

花粉[kafun] pollen
花粉症[kafunshou] hay fever
滑石粉[kassekiko] talcum powder
くず粉[kuzuko] kudzu starch
強力粉[kyourikiko] bread flour