affiliation vs tie-up

affiliation and tie-up both are nouns.

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

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

Other synonyms of affiliation include association, tie.

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