Solutions A twenty-one-pin socket used to connect video equipment has 6 entries with similar clues

• 5-letter words
• quireSet of twenty-four or twenty-five sheets of paper
• 7-letter words
• adaptorA device for connecting several electrical plugs to one socket
• adapterA device for connecting several electrical plugs to one socket
• 8-letter words
• solsticeTwenty-first June or twenty-second December
• februaryPeriod of twenty-eight or twenty-nine days
• 13-letter words
• playing-cardsTwenty-six red and twenty-six black