Answer:

HYDRAS

Answer	Crossword Clue
HYDRAS	Freshwater polyps
HYDRAS	Tubelike water animals
HYDRAS	Mythological sea serpents

HYDRAS	Many-headed serpents
HYDRAS	"Water serpents"
HYDRAS	Many-headed monsters.
HYDRAS	Freshwater polyps.
HYDRAS	Polyps or many-sided problems
HYDRAS	Many-sided problems
HYDRAS	Tentacled sea creatures
HYDRAS	Jellyfish relatives named for a mythological monster

HYDRAS	Many-headed mythical sea monsters
HYDRAS	Many-headed mythical monsters