Somalian vs African

Somalian and African both are nouns.

Word	Noun	Adjective	Verb	Adverb
Somalian	Yes	Yes	No	No
African	Yes	Yes	No	No

As nouns, African is a hypernym of Somalian; that is, African is a word with a broader meaning than Somalian:

Somalian (noun)	African (noun)
a member of a tall dark (mostly Muslim) people inhabiting Somalia	a native or inhabitant of Africa

Somalian (adjective)	African (adjective)
of or relating to the African republic of Somalia or its people or their language and culture	of or relating to the nations of Africa or their peoples