friendship vs friendly relationship

friendship and friendly relationship both are nouns.

Word	Noun	Adjective	Verb	Adverb
friendship	Yes	No	No	No
friendly relationship	Yes	No	No	No

As nouns, friendship and friendly relationship are synonyms defined as:

friendship and friendly relationship: the state of being friends (or friendly)

friendship (noun)	friendly relationship (noun)
the state of being friends (or friendly)	the state of being friends (or friendly)