Meaning of words into component parts

Stuck on this task and could really do with some help - would be very much appreciated.

Task 2
Segment the meaning of the following words into their component parts, using language that is less complex than the words themselves.

A poster -
Example:
It has a big picture or an advertisement.
It's made of paper.
You can put it on a wall in your house.
You can see very big ones on buildings or beside the road.
Many advertise cars, beer, cigarettes, airlines, Coca-Cola, etc.

These are the words I've got to do:

a library

a bookshop

a lake

Any suggestions for any of these? Thanks.