List: word usually written using kana alone

usually written using kana alone  noun  noun (generic) 

• phoronid (any wormlike animal of phylum Phoronida)

usually written using kana alone  noun  noun (generic) 

• lingulate brachiopod (esp. species Lingula anatina)

usually written using kana alone  rare term  noun  noun (generic) 

• lampshell (excluding the lingulate brachiopods), lamp shell

usually written using kana alone  noun  noun (generic) 

• peanut worm (any worm of phylum Sipuncula)

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

• echiurid, spoon worm
• fat innkeeper worm (Urechis unicinctus), penis fish

usually written using kana alone  rare term  noun  noun (generic) 

• tongue worm (any worm of phylum Pentastomida)

usually written using kana alone  rare term  noun  noun (generic) 

• beard worm (any worm of phylum Pogonophora)

usually written using kana alone  noun  noun (generic) 

• vestimentiferan (any tube worm of order Vestimentifera)

usually written using kana alone  noun  noun (generic) 

• arrow worm (any worm of phylum Chaetognatha)

usually written using kana alone  noun  noun (generic) 

• acorn worm (any hemichordate of class Enteropneusta)