Tweedledum and Tweedledee vs Tweedledee and Tweedledum

Tweedledum and Tweedledee and Tweedledee and Tweedledum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tweedledum and Tweedledee	Yes	No	No	No
Tweedledee and Tweedledum	Yes	No	No	No

As nouns, Tweedledum and Tweedledee and Tweedledee and Tweedledum are synonyms defined as:

Tweedledum and Tweedledee and Tweedledee and Tweedledum: any two people who are hard to tell apart

Tweedledum and Tweedledee (noun)	Tweedledee and Tweedledum (noun)
any two people who are hard to tell apart	any two people who are hard to tell apart