Homophones (words with the same pronunciation but different spelling and meaning):
* Seel (archaic spelling of "seal")
* Zeal (great enthusiasm or fervor)
Near rhymes (words with similar vowel sounds but different consonant sounds):
* Heal
* Meal
* Real
* Steel
Words with a similar "s" sound but different vowel sound:
* Seize
* Swell
* Sell
* Shell
Please note that these are just a few examples, and there might be other words that sound similar to "seal" depending on the specific dialect or accent used.