A gearbox is another name for a transmission.
A crossing guard.
Compression ignition engine.
a quadrilateral sideways, a pentagon looks like a crown.
A bridge is another word for an overpass across water.
a bridge maybe?
Another name for an animal burrow is a den. My dad and I came across this answer in a crossword puzzle.
An acrostic poem :)
If by movement you mean tilting it is called roll. There is no name for a boat simply moving sideways.
From completing crosswords I have often come across the name Ani as a name for a black cuckoo.
The movie Sideways was based on a novel of the same name by Rex Pickett. It is a 2004 novel.