Schists

1 clue
Crystalline rocks
Similar answers:
Aboutschmidt
Abraceofdentists
Abstractionists
Activists
Actualists
Acupuncturists
Adamsedarischumer
Adeschool
Aerialists
Aeschylus
Ageists
Agists
Agonists
Aheadofschedule
Alarmists
Albertschweitzer
Alchemists
Alcottschillungotrhythm
Alienists
Alists