subgrade

As nouns the difference between subgrade and roadbase

is that subgrade is the layer of native soil on which the foundation of a road is laid while roadbase is the layer of aggregates under the paved layer of a road.

As an acronym base

is b'''uilding'', '''''a'''ntenna-tower'', '''''s'''pan'', '''''e arth .

As a noun subgrade is

the layer of native soil on which the foundation of a road is laid.

As nouns the difference between taxonomy and subgrade

is that taxonomy is the science or the technique used to make a classification while subgrade is the layer of native soil on which the foundation of a road is laid.

As nouns the difference between subgrade and roadbed

is that subgrade is the layer of native soil on which the foundation of a road is laid while roadbed is the prepared location for a road, including its foundation.

As nouns the difference between subbase and subgrade

is that subbase is the lowest projecting part of a baseboard, a pedestal or a similar construct while subgrade is the layer of native soil on which the foundation of a road is laid.

As nouns the difference between road and subgrade

is that road is (obsolete) the act of riding on horseback while subgrade is the layer of native soil on which the foundation of a road is laid.

As nouns the difference between foundation and subgrade

is that foundation is the act of founding, fixing, establishing, or beginning to erect while subgrade is the layer of native soil on which the foundation of a road is laid.

As nouns the difference between soil and subgrade

is that soil is (uncountable) a mixture of sand and organic material, used to support plant growth or soil can be (uncountable|euphemistic) faeces or urine etc when found on clothes or soil can be a wet or marshy place in which a boar or other such game seeks refuge when hunted while subgrade is the layer of native soil on which the foundation of a road is laid.

As a verb soil

is to make dirty or soil can be to feed, as cattle or horses, in the barn or an enclosure, with fresh grass or green food cut for them, instead of sending them out to pasture; hence (such food having the effect of purging them), to purge by feeding on green food.

As nouns the difference between layer and subgrade

is that layer is a single thickness of some material covering a surface while subgrade is the layer of native soil on which the foundation of a road is laid.

As a verb layer

is to cut or divide (something) into layers.