au fait /ō feˈ/

1. Well-acquainted with a matter
2. Well-informed, expert (with with)

• washiness
• washinesses
• washing
• washing-blue
• washing-board
• washing-bottle
• washing-day
• washing-house
• washing line
• washing lines
• washing liquid
• washing machine
• washing machines
• washing powder
• washing powders
• washings
• washing-soda
• Washingtonia
• washing-up
• washing-up machine
• washing-up machines
• wash-ins
• wash its face
• washland
• washlands