If you want the dictionary definition, just double click on any word.

Loose is an adjective. If something isn't fixed properly or it doesn't fit, because it's too large, it's loose.

For example:-

My headphones weren't working, because a wire was loose.

Lose is a verb that means to no longer possess something because you do not know where it is, or because it has been taken away from you.

For example:

A lot of people will lose their job if there is a recession.
My husband is always losing his keys.