Cuberoots

2 clues
Math extractions
3 for 27, 4 for 64, etc.
Similar answers:
Arrowroots
Astroturfroots
Bearcubes
Bitterroots
Boobscubes
Bootsroots
Bouilloncube
Bouilloncubes
Breakercubeberg
Cheroots
Cube
Cubeb
Cubebs
Cubed
Cubedbug
Cubedfellow
Cubedtomato
Cubefarm
Cuberoot
Cuberoots