There is a word which means looking into windows at night out of curiosity it long least four syllables does anyone know what is?

There isn't a single word in common English that perfectly captures the act of "looking into windows at night out of curiosity."

However, you can use a combination of words or phrases to describe this:

* Window-peeping (colloquial, implies a bit of mischievousness)

* Nighttime window gazing (more neutral, emphasizes the curiosity)

* Nocturnal observation (formal, focuses on the act of watching)

* Peeking into illuminated windows (more descriptive, highlights the visible light)

Ultimately, the best choice depends on the specific context and tone you want to convey.