亜綱[akou] (biological) subclass
井戸綱[idozuna] well rope
井綱[izuna] well rope
横綱[yokozuna] yokozuna (grand champion)
綱曳き[tsunahiki] tug of war (orig. a form of divination to predict whether the year will be favourable or unfavourable)

綱紀[kouki] law and order
綱紀粛正[koukishukusei] eliminating corruption among government officials
綱渡り[tsunawatari] tightrope walking
綱要[kouyou] elements

お花見[ohanami] cherry blossom viewing
一花[hitohana] success
卯の花[unohana] bean-curd lees
雲鬢花顔[unbinkagan] beautiful woman (metaphorical)
黄花[kouka] chrysanthemum

火花[hibana] spark
花の木[hananoki] flowering tree
花瓣[hanabira] (flower) petal
花より団子[hanayoridango] dumplings rather than flowers