jonquil vs daffodil

jonquil and daffodil both are nouns.

Word	Noun	Adjective	Verb	Adverb
jonquil	Yes	No	No	No
daffodil	Yes	No	No	No

As nouns, daffodil is a hypernym of jonquil; that is, daffodil is a word with a broader meaning than jonquil:

jonquil: often used colloquially for any yellow daffodil
daffodil: any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown

Other hypernyms of jonquil include Narcissus pseudonarcissus.

jonquil (noun)	daffodil (noun)
widely cultivated ornamental plant native to southern Europe but naturalized elsewhere having fragrant yellow or white clustered flowers	any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown
often used colloquially for any yellow daffodil