Umma vs Ummah

Umma and Ummah both are nouns.

Word	Noun	Adjective	Verb	Adverb
Umma	Yes	No	No	No
Ummah	Yes	No	No	No

As nouns, Umma and Ummah are synonyms defined as:

Umma and Ummah: the Muslim community or people, considered to extend from Mauritania to Pakistan

Other synonyms of Umma include Islam Nation, Islamic Ummah, Muslim Ummah.

Umma (noun)	Ummah (noun)
the Muslim community or people, considered to extend from Mauritania to Pakistan	the Muslim community or people, considered to extend from Mauritania to Pakistan