serendipity.
/ˌsɛrənˈdɪpəti/ noun
The luck of finding something good when you weren't looking for it.
It’s all in the nuance.
Luck is any good fortune; serendipity is the happy accident, stumbling onto the thing while chasing something else.
chanceneutral; could go either way
flukea lucky accident, but usually a one-off with less charm
windfalla lump of money or good fortune dropping into your lap
Hear it in context.
At work
“The feature came from serendipity, a support ticket read by the wrong engineer; we should design for more of that.”
In a story
“Every good thing in my life came from serendipity and a slightly late bus.”
Take it into your day.
Tell someone about one moment of serendipity in your life today, and use the word when you do.