Units

20 clues
Ones
Items
Monads
Entities
Entitles
Elements
Divisions
Components
Apartments
Yards, e.g.
Troop groups
Army outfits
Condos, e.g.
Seconds, e.g.
Hands and feet
Military groups
Single entities
Groups of troops
Chapters in history
Landlords' concerns
Similar answers:
Aarondirtylaundry
Abadwaytolunch
Abandits
Abaserunner
Abbashitsingle
Abcrunch
Abcrunches
Abits
Abitsimple
Abitsteep
Abound
Abounded
Aboundin
Abounding
Abounds
Aboveground
Abovegroundpool
Abovethewaits
Abun
Abunch