ice hockey rink vs ice-hockey rink

ice hockey rink and ice-hockey rink both are nouns.

Word	Noun	Adjective	Verb	Adverb
ice hockey rink	Yes	No	No	No
ice-hockey rink	Yes	No	No	No

As nouns, ice hockey rink and ice-hockey rink are synonyms defined as:

ice hockey rink (noun)	ice-hockey rink (noun)
an ice rink for playing ice hockey	an ice rink for playing ice hockey