dao

As a noun taxonomy

is the science or the technique used to make a classification.

As a proper noun dao is

river (portuguese river).

As a noun firearm

is a personal weapon that uses explosive powder to propel a metal (usually lead) projectile.

As a proper noun dao is

river (portuguese river).

As a noun law

is (lb) the body of rules and standards issued by a government, or to be applied by courts and similar authorities or law can be (obsolete) a tumulus of stones.

As an interjection law

is (dated) an exclamation of mild surprise; lawks.

As an adverb dao is

there or dao can be for that reason.

Dao is an alternative form of tao.

As a adverb dao

is there or dao can be for that reason.

As a noun tao is

(taoism) the essential principle underlying existence; ultimate reality.