What words end with the suffix ion not tion?

You're right to point out the distinction! While "-tion" is a common suffix, "-ion" is also used in some words. Here are some words that end with "-ion" (not "-tion"):

Common Words:

* Lion

* Onion

* Million

* Trillion

* Billion

* Fashion

* Legion

* Collision

Less Common Words:

* Aspersion (a damaging remark)

* Concision (brevity)

* Decision

* Evasion (avoiding)

* Pension

* Precision

* Provision

* Revision

Note: Some words can be spelled with either "-tion" or "-ion" depending on their origin and meaning. For example, "action" and "passion" are spelled with "-tion" while "potion" and "motion" are spelled with "-ion."

Let me know if you'd like me to explore any other word families or suffixes!