All are units of time.

All represent group. 'Crowd' is a group of people; 'Shoal' a group of fish and 'Team' is a group of fish and 'Team' is a group of players.

All are the names of parliaments 'Duma' is the parliament of Russia; Maqlis is the parliament of Iran/Maldives/Malaysia and 'Khural' is the parliament of Mangolia.

Young ones of given animals are called cub.

All are cereals.

All are games.

All are insects.

All are females.

All work in the hospital.

All are rivers.