What are some words with greek root ast?

'Democracy'.

Demos ; the people

Cratos ; the rule/law.

Its modern meaning is the 'rule of the will of the people'.

Chloros ; Green

As in Chlorine ( Green gas)

Or Chlorophyl. (Biology).

Also 'Demonstration' and 'Demographics'.

Also christian/first names of Greek origin. ;-

Alexander/Alexandra

Hector

Ulysses.

Helen

Penelope

Persephone