brotherhood vs friendliness

brotherhood and friendliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
brotherhood	Yes	No	No	No
friendliness	Yes	No	No	No

As nouns, friendliness is a hypernym of brotherhood; that is, friendliness is a word with a broader meaning than brotherhood:

brotherhood: the feeling that men should treat one another like brothers
friendliness: a feeling of liking for another person; enjoyment in their company

brotherhood (noun)	friendliness (noun)
the feeling that men should treat one another like brothers	a friendly disposition
people engaged in a particular occupation	a feeling of liking for another person; enjoyment in their company
an organization of employees formed to bargain with the employer
the kinship relation between a male offspring and the siblings