demurral vs demurrer

demurral and demurrer both are nouns.

Word	Noun	Adjective	Verb	Adverb
demurral	Yes	No	No	No
demurrer	Yes	No	No	No

As nouns, demurral and demurrer are synonyms defined as:

demurral and demurrer: (law) a formal objection to an opponent's pleadings

Other synonyms of demurral include demur.

demurral (noun)	demurrer (noun)
(law) a formal objection to an opponent's pleadings	a defendant's answer or plea denying the truth of the charges against him
	(law) a formal objection to an opponent's pleadings
	(law) any pleading that attacks the legal sufficiency of the opponent's pleadings