Common words:
* Lapse (noun): a temporary failure of concentration or memory
* Elapse (verb): to pass, go by (referring to time)
Less common words:
* Relapse (noun/verb): to fall back into a former state, especially an undesirable one (like an illness or bad habit)
* Collapse (verb/noun): to fall down suddenly, often due to weakness or injury
* Elapse (verb): to pass, go by (referring to time)
Words with related meanings:
* Lap (noun): the upper part of a person's legs when sitting
* Slip (verb/noun): to slide or move unintentionally
* Fail (verb): to be unsuccessful
* Decline (verb/noun): to decrease in quality or quantity
Let me know if you'd like me to explore any of these words further or find other related terms!