rink vs skating rink

rink and skating rink both are nouns.

Word	Noun	Adjective	Verb	Adverb
rink	Yes	No	No	No
skating rink	Yes	No	No	No

As nouns, rink and skating rink are synonyms defined as:

rink and skating rink: building that contains a surface for ice skating or roller skating

rink (noun)	skating rink (noun)
building that contains a surface for ice skating or roller skating	building that contains a surface for ice skating or roller skating