List: word usually written using kana alone

usually written using kana alone  noun  noun (generic)  archaic 

• goosefish (any fish of family Lophiidae), monkfish, sea devil
• curved gutter
• fool

rarely used kanji form  usually written using kana alone  noun  noun (generic) 

• goby (fish)
• yellowfin goby (Acanthogobius flavimanus)

usually written using kana alone  noun  noun (generic) 

• flathead (esp. the bartailed flathead, Platycephalus indicus)

ateji  usually written using kana alone  noun  noun (generic)  slang  noun (prefix) 

• dried squid, dried cuttlefish
• Japanese common squid (Todarodes pacificus)
• (thing that) grows on one over time

rarely used kanji form  usually written using kana alone  noun  noun (generic)  rare term 

• striped mullet (Mugil cephalus), flathead grey mullet, black mullet
• redlip mullet (Chelon haematocheilus)

search-only kana form  rarely used kanji form  search-only kanji form  usually written using kana alone  expression  adverb 

• in the end, after all is said and done

usually written using kana alone  noun  noun (generic)  abbreviation 

• orca (Orcinus orca), killer whale, grampus
• shachi, mythical carp with the head of a tiger and the body of a fish, considered auspicious protectors of well-being
• roof ornament in the shape of a shachi (believed to provide protection against fire by causing rain to fall)

rarely used kanji form  usually written using kana alone  noun  noun (generic) 

• shachihoko, shachi, mythical animal with the head of a tiger and the body of a fish
• roof ornament in the shape of a shachihoko (believed to provide protection against fire by causing rain to fall)

usually written using kana alone  noun  noun (generic)  archaic 

• catfish (esp. the Amur catfish, Silurus asotus)
• earthquake

rarely used kanji form  usually written using kana alone  noun  noun (generic) 

• gills, branchia
• angle of the mandible, gonial angle