Many modern English words have Greek roots. Greek origin of English words is especially obvious in terms related to the sciences. However, there are also common words used daily with Greek roots. Here are some of them...
Alphabet - the first two letters of the Greek language combined
Galaxy - from the Greek word “gala” meaning milk, hence Milky Way
Marathon - a field outside of Athens where a famous battle of 490 BC took place
Melancholy - from the Greek words “melas” meaning “black” and “choly” meaning “bile”
Telephone - from the Greek words “tele” meaning “far” and “phone” meaning “voice”
Mathematics
Panic
Democracy
Academy
Eureka
Dynamic
Strategy
Metaphoric
Bulimia
Chaos
Demon
Gymnasium
Idea
Museum
Planet
Tyranny
Utopia