Dividers

3 clues
Highway areas
Features in some rooms
Boundaries, and a hint to the puzzle's starred answers
Similar answers:
Abcmurders
Abiders
Abraders
Academicladders
Acceders
Adders
Adderstongue
Adivinityinthat
Adogofflanders
Aheapofhotrodders
Ahosedivided
Ahousedivided
Aiders
Alandershowitz
Alders
Aldershot
Alderstatesman
Alexanders
Alexandersragtimeband
Anders