If you're looking for words with the same vowel-consonant-vowel pattern:
* Sham
* Slam
* Clam
* Spam
* Flaw
* Glamp
If you're looking for words with the same ending consonant cluster:
* Pam
* Ram
* Sam
* Tam
If you're looking for words with a similar meaning:
* Squash
* Crowd
* Squeeze
Let me know if you had a specific type of word in mind!