fontanelle or fontanel /fon-tə-nelˈ/

1. A membrane-covered gap between the immature parietal bones in the skull of a fetus or infant
2. An opening for discharge (medicine)

• fire truck
• fire trucks
• fire-tube
• fire-tubes
• fire up
• fire-walk
• fire-walker
• fire-walkers
• fire-walking
• fire-walks
• firewall
• firewalls
• fire-warden
• fire-wardens
• fire-watcher
• fire-watchers
• fire-watching
• firewater
• firewaters
• fireweed
• fireweeds
• Fire'wire®
• firewoman
• firewomen
• firewood