Perfect rhymes (not ideal due to the strong connotation):
* castards (an archaic term for "cast-offs")
* fastards (a made-up word)
Near rhymes (slant rhymes):
* masters
* disaster
* faster
* pastor
* plaster
Words that sound similar but don't rhyme:
* bastardly
* bastion
* baste
Consider these factors when choosing a rhyme:
* The tone of your writing: Do you need a harsh, humorous, or neutral rhyme?
* The context of your writing: What is the subject of your work?
Ultimately, the best rhyme will depend on your specific needs and the overall feel you want to achieve.