鯔背[inase] gallant
違背[ihai] violation
棄背[kihai] giving up and turning back
向背[kouhai] one's attitude
上背[uwazei] stature

側背[sokuhai] flank
団栗の背比べ[dongurinoseikurabe] having no outstanding characteristics
中肉中背[chuunikuchuuzei] medium build
中背[chuuzei] average height
二律背反[niritsuhaihan] antinomy

三指鴎[mitsuyubikamome] black-legged kittiwake
フルマ鴎[furumakamome] northern fulmar (Fulmarus glacialis)
百合鴎[yurikamome] black-headed gull (Larus ridibundus)
笑い鴎[waraikamome] laughing gull (larus atricilla)
大フルマ鴎[oofurumakamome] giant petrel (esp. the southern giant petrel, Macronectes giganteus)

斑フルマ鴎[madarafurumakamome] Cape pigeon
背黒鴎[segurokamome] herring gull (Larus argentatus)
盗賊鴎[touzokukamome] skua (any bird of family Stercorariidae, inc. the jaegers)
黒盗賊鴎[kurotouzokukamome] parasitic jaeger

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