building block 
noun
1A child’s wooden or plastic toy brick.These are quite old fashioned toys, like wooden building blocks, wooden yachts and so on....
- In the Mendelson hall, for example, there is a box of Lego and another of wooden building blocks.
- It consists of seven boxes that purport to contain sets of the popular Lego brand plastic building blocks.
2A basic unit from which something is built up: sounds are the building blocks of language...
- When I was going to those places, sometimes I would have to take what would roughly equate to an infantry section, which is the basic building block of a military unit.
- This was important to physicists because all the basic building blocks of matter are fermions.
- Again, the conclusion is that there is a rather small region of parameter space in which the basic building blocks of chemical complexity can exist.
- culture clash
- culture contact
- cultured
- culturedness
- culture festival
- culture gap
- culture hero
- culture heroine
- culture jammer
- culture jamming
- culture lag
- cultureless
- culture medium
- culture plate
- culturer
- culture shock
- culture vulture
- culture war
- culture warrior
- culturgen
- culturism
- culturist
- culturological
- culturologist
- culturology