bitumen

As a noun bitumen

is bitumen.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between bitumen and petroleum

is that bitumen is bitumen while petroleum is petroleum.

As nouns the difference between bitumen and coal

is that bitumen is bitumen while coal is (uncountable) a black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel.

As a verb coal is

to take on a supply of coal (usually of steam ships).

As nouns the difference between bitumen and emulsion

is that bitumen is bitumen while emulsion is emulsion.

As nouns the difference between bitumen and log

is that bitumen is bitumen while log is law.

As a noun bitumen is

bitumen.

As a noun bitumen is

bitumen.

As an adjective bitumed

is (obsolete) smeared with bitumen.

As a noun bitumen is

bitumen.

As nouns the difference between taxonomy and bitumen

is that taxonomy is the science or the technique used to make a classification while bitumen is bitumen.

As a noun bitumen is

bitumen.