稲穂[inaho] ear (head) of rice
花穂[kasui] spike (in botany)
刈穂[kariho] harvested grain
垂り穂[tariho] drooping ears (of grain)
瑞穂の国[mizuhonokuni] Japan, the Land of Abundant Rice

穂先[hosaki] ear (e.g. of wheat)
落穂拾い[ochibohiroi] gleaning (i.e. picking up crop left after harvesting)
黒穂[kuroho] smut
穂状[suijou] shaped like an ear of grain

お歯黒[ohaguro] tooth blackening
暗黒期[ankokuki] eclipse period
暗黒時代[ankokujidai] Dark Ages
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
黒い[kuroi] black

黒い霧[kuroikiri] thick fog
黒くする[kurokusuru] to blacken
黒ずむ[kurozumu] to blacken
黒っぽい[kuroppoi] dark