στρατός
stratós
“army, encamped host”
4 words in English grow from this root.
Stratagem
Politicsστρατόςstratós
“an army-leader's deed”
Strategist
Politicsστρατόςstratós
“army leader”
Strategy
Politicsστρατόςstratós
“army leading”
Stratocracy
Politicsστρατόςstratós
“rule by the army”