Here are some examples of words with the suffix -acious:
* Audacious: full of daring or boldness
* Capacious: able to hold a lot; spacious
* Gregarious: fond of company; sociable
* Loquacious: talkative; garrulous
* Sagacious: having or showing keen mental discernment and good judgment; wise
* Voracious: having a very eager appetite for food or other things; ravenous
Essentially, the suffix -acious adds a quality or characteristic to the base word.