According to the search results, there are many words that rhyme with "again". Here are some examples:

• Gren
• Panchen
• Maren
• Wrenn
• Rain
• Sandplain
• Stain
• Strain
• Tearstain
• Unrein
• Urbain
• Vactrain
• Wabain
• Train
• Plane
• Pain
• Vein
• Chain
• When
• Brain
• Explain
• Plain
• Insane
• Men

These are just a few examples, and there are many more listed in the search results.