Islam vs Alawism

Islam and Alawism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Islam	Yes	No	No	No
Alawism	Yes	No	No	No

As nouns, Alawism is a hyponym of Islam; that is, Alawism is a word with a more specific, narrower meaning than Islam:

Islam: the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran
Alawism: a branch of Shiism practiced especially in northwest Syria and adjacent parts of Turkey and Lebanon.

Other hyponyms of Islam include Mahdism, Salafi movement, Salafism, Shiism, Wahabism, Wahhabism, Ash'arism.

Islam (noun)	Alawism (noun)
the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran	a branch of Shiism practiced especially in northwest Syria and adjacent parts of Turkey and Lebanon.
the civilization of Muslims collectively which is governed by the Muslim religion