duo

As an adjective dum is

cooked with steam.

As an interjection dum is

.

As a noun dun is

fortress.

As a verb dun is

to close, shut.

As a verb doo is

.

As a noun dud

is (informal) a device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile.

Duo is a descendant of due.

As nouns the difference between due and duo

is that due is deserved acknowledgment while duo is a twosome, especially musicians.

As an adjective due

is owed or owing.

As an adverb due

is directly; exactly.

As a proper noun Duo is

an unincorporated community in West Virginia.

As a noun dug

is (chiefly|in the plural) on domestic mammal containing more than two breasts.

As a verb dug

is (dig).

Duo is a descendant of dua.

As nouns the difference between dua and duo

is that dua is an Islamic invocation while duo is a twosome, especially musicians.

As a proper noun Duo is

an unincorporated community in West Virginia.

As a verb dub

is (lb) to confer knighthood; the conclusion of the ceremony was marked by a tap on the shoulder with the sword or dub can be to make a copy from an original or master audio tape or dub can be to make a noise by brisk drumbeats.

As a noun dub

is (music) a mostly instrumental remix with all or part of the vocals removed or dub can be (uk|dialect) a pool or puddle or dub can be (slang) a twenty dollar sack of marijuana or dub can be (rare) a blow.

As a noun taxonomy

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