一本松[ipponmatsu] solitary pine tree
下がり松[sagarimatsu] drooping pine
松魚[shougyo] skipjack tuna
黒松[kuromatsu] black pine
市松[ichimatsu] checked (pattern)

小松菜[komatsuna] Japanese mustard spinach (Brassica rapa var. perviridis)
松の木[matsunoki] pine tree
松下電器[matsushitadenki] Matsushita Electric Industrial
松下電工[matsushitadenkou] Matsushita Electric Works

悪水[akusui] undrinkable water
井戸水[idomizu] well water
一衣帯水[ichiitaisui] (being separated only by a) narrow strip of water
一水[issui] current (of water)
溢水[issui] inundation

飲水量[insuiryou] amount of drinking
飲料水[inryousui] drinking water
烏の行水[karasunogyouzui] quick bath
雲水[unsui] itinerant priest
塩化水素[enkasuiso] hydrogen chloride

ムール貝[muurugai] moule
一枚貝[ichimaigai] univalve
烏貝[karasugai] cockscomb pearl mussel (Cristaria plicata)
貝ボタン[kaibotan] mother-of-pearl button
貝貨[baika] shell money

貝がら[kaigara] shell
貝柱[kaibashira] adductor muscle
貝毒[kaidoku] shellfish poison
貝類[kairui] shellfish