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