boulder

As nouns the difference between cobblestone and boulder

is that cobblestone is a rounded stone from a river bed, fit for use as ballast in ships and for paving roads while boulder is a large mass of stone detached from the surrounding land.

As a verb boulder is

to engage in bouldering.

As a noun boulder

is a large mass of stone detached from the surrounding land.

As a verb boulder

is to engage in bouldering.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun boulder

is a large mass of stone detached from the surrounding land.

As a verb boulder

is to engage in bouldering.

As an adjective undefined is

lacking a definition or value.

In geology|lang=en terms the difference between erratic and boulder

is that erratic is (geology) a rock moved from one location to another, usually by a glacier while boulder is (geology) a particle greater than 256 mm in diameter, following the wentworth scale.

As nouns the difference between erratic and boulder

is that erratic is (geology) a rock moved from one location to another, usually by a glacier while boulder is a large mass of stone detached from the surrounding land.

As an adjective erratic

is unsteady, random; prone to unexpected changes; not consistent.

As a verb boulder is

to engage in bouldering.

As nouns the difference between ballast and boulder

is that ballast is while boulder is a large mass of stone detached from the surrounding land.

As a verb boulder is

to engage in bouldering.

As nouns the difference between boulder and log

is that boulder is a large mass of stone detached from the surrounding land while log is law.

As a verb boulder

is to engage in bouldering.

As nouns the difference between tours and boulder

is that tours is while boulder is a large mass of stone detached from the surrounding land.

As verbs the difference between tours and boulder

is that tours is (tour) while boulder is to engage in bouldering.

As nouns the difference between gravel and boulder

is that gravel is small fragments of rock, used for laying on the beds of roads and railroads, and as ballast while boulder is a large mass of stone detached from the surrounding land.

As verbs the difference between gravel and boulder

is that gravel is to apply a layer of gravel to the surface of a road, etc while boulder is to engage in bouldering.

In geology terms the difference between boulder and crag

is that boulder is a particle greater than 256 mm in diameter, following the Wentworth scale while crag is a partially compacted bed of gravel mixed with shells, of the Tertiary age.

As nouns the difference between boulder and crag

is that boulder is a large mass of stone detached from the surrounding land while crag is a rocky outcrop.

As a verb boulder

is to engage in bouldering.

As nouns the difference between glade and boulder

is that glade is an open passage through a wood; a grassy open or cleared space in a forest while boulder is a large mass of stone detached from the surrounding land.

As a verb boulder is

to engage in bouldering.