The campaign was linked to International Literacy Day on 8 September. People can contribute their own words online.
Words are the foundation for any education, but 80 million children around the world cannot go to school, almost half of them because they live in a war zone.
Education Action is asking people to show their support for the need to educate all children by submitting their favourite word on their website.
Head of Development at Education Action Chris Field said: "Giving their favourite word is a great way for people to show their support for the education of all children, particularly on International Literacy Day.
"We've had some really interesting and fun results so far and look forward to seeing more."
Hundreds of people, including MPs, authors and actors, have added their contribution.
