The ending of a story is often referred to as the 'conclusion' or the 'finale'.
A fictional story is often referred to as a 'fiction' or a 'narrative fiction'.
You might hear a sad story being described as a melancholic account. It implies a story filled with sadness and a sense of longing or loss.
Story games are often referred to as narrative games or interactive stories.
A true story is usually referred to as a non-fiction account or a factual narrative.
A short story can often be referred to as a 'narrative vignette' or a 'compact tale'.
A funny story is often referred to as a 'comical tale' or a 'humorous narrative'.
A sad story is often referred to as a tragedy.
A news story is often referred to as a news report or a news article.
A short story is often referred to as a 'novelette' or simply a 'short narrative'.
A long story is often referred to as a 'novel'. Novels usually have complex plots and multiple characters.