Solutions A vertical stair has 24 entries with similar clues

• 4-letter words
• stepPart of a stairway
• mastLong vertical/upright pole
• 5-letter words
• stepsstairs
• plumbVertical
• 6-letter words
• columnVertical division of page
• newelsstair posts
• treadsStair parts
• 7-letter words
• plummetDrop vertically and fast
• uprightStanding vertically
• 8-letter words
• doorstepThreshold stair
• banisterStaircase adjunct
• 9-letter words
• banistersStair railings
• precipiceHigh vertical cliff
• escalatorMechanised staircase
• 10-letter words
• balustradeRailing on stairs or balcony
• plumb-lineDevice to show the vertical
• newel-postThe top or bottom supporting post of a stair rail
• 11-letter words
• taketheliftdon't use the stairs when hitchhiking
• 12-letter words
• drop-curtainA curtain lowered vertically on to a theatre stage
• companionwayStaircase on a ship
• horizontallyAt right angle to the vertical
• 13-letter words
• perpendicularExactly vertical
• loop-the-loopOf an aircraft flying in a vertical circle
• rhyming-slangApples and pears for stairs, for example