golden stars vs golden star

golden stars and golden star both are nouns.

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

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

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

Other synonyms of golden stars include Bloomeria crocea.

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