crown of thorns vs affliction

crown of thorns and affliction both are nouns.

Word	Noun	Adjective	Verb	Adverb
crown of thorns	Yes	No	No	No
affliction	Yes	No	No	No

As nouns, affliction is a hypernym of crown of thorns; that is, affliction is a word with a broader meaning than crown of thorns:

crown of thorns (noun)	affliction (noun)
a mock crown made of thorn branches that Roman soldiers placed on Jesus before the Crucifixion	a cause of great suffering and distress
somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts	a condition of suffering or distress due to ill health
any affliction that causes great suffering	a state of great suffering and distress due to adversity