golden star vs golden stars

golden star and golden stars both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden star	Yes	No	No	No
golden stars	Yes	No	No	No

As nouns, golden star and golden stars are synonyms defined as:

golden star and golden stars: California plant having grasslike leaves and showy orange flowers

Other synonyms of golden star include Bloomeria crocea.

golden star (noun)	golden stars (noun)
California plant having grasslike leaves and showy orange flowers	California plant having grasslike leaves and showy orange flowers