The plural form of gallinule; multiple water birds of the gallinule species.
Simple plural formation from 'gallinule' by adding the standard English '-s' suffix; the base word derives from Latin 'gallinula'.
Interestingly, gallinules are sometimes called 'marsh hens' or 'water hens' in different regions, showing how common names are more fluid and regional than scientific names—you might spot gallinules at different times, calling them by completely different names.
Complete word intelligence in one call. Free tier — 50 lookups/day.