tie-up vs affiliation

tie-up and affiliation both are nouns.

Word	Noun	Adjective	Verb	Adverb
tie-up	Yes	No	No	No
affiliation	Yes	No	No	No

As nouns, tie-up and affiliation are synonyms defined as:

Other synonyms of tie-up include association, tie.

tie-up (noun)	affiliation (noun)
an interruption of normal activity	the act of becoming formally connected or joined
a social or business relationship	a social or business relationship