corn speedwell vs veronica

corn speedwell and veronica both are nouns.

Word	Noun	Adjective	Verb	Adverb
corn speedwell	Yes	No	No	No
veronica	Yes	No	No	No

As nouns, veronica is a hypernym of corn speedwell; that is, veronica is a word with a broader meaning than corn speedwell:

corn speedwell: erect or procumbent blue-flowered annual found in waste places of Europe and America
veronica: any plant of the genus Veronica

Other hypernyms of corn speedwell include speedwell.

corn speedwell (noun)	veronica (noun)
erect or procumbent blue-flowered annual found in waste places of Europe and America	any plant of the genus Veronica