Can you think of one?? I haven’t been able to. Even a search at Synonym.com brought back the result:

Sorry, I could not find synonyms for ‘synonym’

I found some websites that deal with Synonyms though:

• Teacher’s Clubhouse – Grammar Skills
• A lesson on synonyms for Kindergarten
• EdHelper worksheets on Synonyms

I did also find the humourous t-shirts too, if you’re that way inclined. They’re available over at Zazzle.com