Stuff-Things | Commonly Confused Words

Stuff

/stʌf/

Materials or objects of unimportant or unknown kind

“What can all that green stuff be?” said Alice."When did you give the stuff to them?"I wasn't goin' to let him get away with that stuff.

This word has no antonyms

Objects, items, or abstract concepts that are not specifically named

Collecting vintage things is my favorite hobby.She whispered sweet things to comfort the child.The room was filled with colorful and odd things.

Both stuff and things refer to objects or items, but stuff is more informal.
Stuff is often used when the specific items are not important or when they are of a similar type.
Things can refer to more specific items or can imply a variety of different items.
Remember stuff as a collective mass term, like a pile of undifferentiated items.
Things can often be counted or listed, whereas stuff is usually not numerable.