Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
keystone | Yes | No | No | No |
building block | Yes | No | No | No |
keystone (noun) | building block (noun) |
---|---|
the central building block at the top of an arch or vault | a block of material used in construction work |
a central cohesive source of support and stability | a single undivided natural thing occurring in the composition of something else |