Seaweed
noun
かいそう
回想 (かいそう) Reminiscence, Recollection
海藻 (かいそう) Seaweed
昆布 (こんぶ、こぶ) Konbu, Kombu, Konbu Seaweed, Kombu Seaweed
若布 (わかめ) Wakame, Wakame Seaweed
藻 (も) Seaweed, Duckweed, Algae
His kayak かい collected soo そう much Seaweed.