I think all can participate for as long as you follow the rules of the contest. =) there is an ongoing contest for english language category so i believe that you can participate.

Just search for the tag wordchallenge

Cheers!

PS: here is the link: https://steemit.com/wordchallenge/@jassennessaj/word-poetry-challenge-8-update-last-day-of-submission-or-you-can-still-submit-your-entries-or-theme-common-sense