堅魚[katsuo] skipjack tuna
堅い[katai] hard
堅果[kenka] nut
堅苦しい[katakurushii] formal
堅固[kengo] solid

堅持[kenji] holding on to
堅城[kenjou] strong fortress
堅陣[kenjin] stronghold
堅調[kenchou] bullish
堅忍[kennin] perseverance

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

天魚[amago] land-locked variety of red-spotted masu trout (Oncorhynchus masou ishikawae)
海鷂魚[ei] ray (fish)
斉魚[etsu] Japanese grenadier anchovy (Coilia nasus)
旗魚[kajiki] marlin
鶏魚[isagi] chicken grunt (species of fish, Parapristipoma trilineatum)

杜父魚[tofugyo] sculpin (any fish of family Cottidae, inc. the bullheads and the miller's-thumb)
堅魚[katsuo] skipjack tuna
魚網[gyomou] fishing net
魚屋[sakanaya] fish market
魚貝[gyokai] marine products

鰹節[katsubushi] katsuobushi
真魚鰹[managatsuo] butterfish (any fish of family Stromateidae, esp. species Pampus punctatissimus)
鰹木[katsuogi] log on the roof of a shrine set perpendicular to the ridgepole
花鰹[hanagatsuo] dried bonito shavings
鰹の烏帽子[katsuonoeboshi] Portuguese man-of-war (Physalia physalis)

鰹節虫[katsuobushimushi] dermestid beetle
猫に鰹節[nekonikatsuobushi] temptation one can't resist
初鰹[hatsugatsuo] the first bonito of the season
歯鰹[hagatsuo] striped bonito (Sarda orientalis)