king's spear vs yellow asphodel

king's spear and yellow asphodel both are nouns.

Word	Noun	Adjective	Verb	Adverb
king's spear	Yes	No	No	No
yellow asphodel	Yes	No	No	No

As nouns, king's spear and yellow asphodel are synonyms defined as:

king's spear and yellow asphodel: asphodel with leafy stem and fragrant yellow flowers

Other synonyms of king's spear include Asphodeline lutea.

king's spear (noun)	yellow asphodel (noun)
asphodel with leafy stem and fragrant yellow flowers	asphodel with leafy stem and fragrant yellow flowers