birl vs twirl

birl is not a noun while twirl is a noun.

Word	Noun	Adjective	Verb	Adverb
birl	No	No	Yes	No
twirl	Yes	No	Yes	No

As verbs, birl and twirl are synonyms defined as:

Other synonyms of birl include spin, whirl.

birl (noun)	twirl (noun)
	the act of rotating rapidly
	a sharp bend in a line produced when a line having a loop is pulled tight

birl (verb)	twirl (verb)
cause to spin	turn in a twisting or spinning motion
cause a floating log to rotate by treading	cause to spin