Sunnah vs Sunna

Sunnah and Sunna both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sunnah	Yes	No	No	No
Sunna	Yes	No	No	No

As nouns, Sunnah and Sunna are synonyms defined as:

Sunnah and Sunna: (Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and practices of Muhammad and interpretations of the Koran

Other synonyms of Sunnah include hadith.

Sunnah (noun)	Sunna (noun)
(Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and practices of Muhammad and interpretations of the Koran	(Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and practices of Muhammad and interpretations of the Koran