Final answer:
The two GHS signal words are Danger and Warning. These signal words are used on hazard diamond labels to indicate the level of hazard associated with a chemical substance.
Step-by-step explanation:
The two GHS signal words are Danger and Warning. These signal words are used on hazard diamond labels to indicate the level of hazard associated with a chemical substance. The signal word Danger is used for chemicals that present a higher level of hazard, while the signal word Warning is used for chemicals that present a slightly lower level of hazard.