Nouns:
* Safe: (a strong box or container for valuables)
* Safety: (the state of being safe from harm)
* Safeguard: (a measure taken to protect someone or something)
* Safekeeping: (the act of protecting something from harm)
Adjectives:
* Safe: (not dangerous or risky)
* Safer: (more safe)
* Safest: (most safe)
Verbs:
* Safeguard: (to protect someone or something)
Adverbs:
* Safely: (in a safe way)
Other:
* Safety net: (a system or program designed to protect people from financial or social hardship)
* Safety conscious: (aware of and concerned about safety)
* Safety first: (a phrase emphasizing the importance of safety)
Let me know if you'd like any more examples!