素

also 元 · 本 · 基

1. noun, esp. 元 origin; source; beginning
2. oft. 基 basis; base; foundation; root
3. also written as 因, 原 cause
4. esp. 素 (raw) material; ingredient; base; mix (e.g. for a cake); (soup) stock
5. root (of a plant); (tree) trunk
6. part (of a brush, chopsticks, etc.) one holds (with the hand)
7. first three lines of a waka

す

1. noun one's nature; one's feelings; oneself
2. takes の plain; unadorned; undecorated; unadulterated; au naturel
3. prefix, derogatory, before a noun mere; poor
4. before an adjective exceedingly

そ

1. noun white silk
2. mathematics prime
3. chemistry principle