1. cornerstone
2. foundation stone
Kanji
1. cornerstone
2. foundation stone
1. foundation stone; cornerstone
1. Foundational; Basic
1. Foundations; Base
1. Foundation; Basis
1. Probably the foundation.; Likely a foundation.
1. It is not the foundation.; It is not the basis.
1. Was the foundation; Was the basis
1. Not a foundation.; Not a basis.
1. If/when foundation; If/when basis