thyme-leaved speedwell vs Veronica serpyllifolia

thyme-leaved speedwell and Veronica serpyllifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
thyme-leaved speedwell	Yes	No	No	No
Veronica serpyllifolia	Yes	No	No	No

As nouns, thyme-leaved speedwell and Veronica serpyllifolia are synonyms defined as:

thyme-leaved speedwell and Veronica serpyllifolia: perennial decumbent herb having small opposite leaves and racemes of blue flowers; throughout Eurasia and the New World

thyme-leaved speedwell (noun)	Veronica serpyllifolia (noun)
perennial decumbent herb having small opposite leaves and racemes of blue flowers; throughout Eurasia and the New World	perennial decumbent herb having small opposite leaves and racemes of blue flowers; throughout Eurasia and the New World