Tweedledee and Tweedledum vs Tweedledum and Tweedledee

Tweedledee and Tweedledum and Tweedledum and Tweedledee both are nouns.

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

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

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

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