Stuff-Things | Commonly Confused Words

Stuff

/stʌf/

A collection of things or materials that are undefined or unspecified

“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.

Objects, items, or matters; refers to anything that is not specified or not known

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

Stuff is often used for non-specific items you can touch or for intangible concepts like information or knowledge.
Things typically refers to objects you can see or describe, both tangible and intangible, but tends to be more specific than stuff.
Remember that stuff is informal and used more in spoken language.
Things can also imply a sequence or a collection of items logically grouped.
Stuff is more collective and less countable than things.