devil's flax vs Linaria vulgaris

devil's flax and Linaria vulgaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
devil's flax	Yes	No	No	No
Linaria vulgaris	Yes	No	No	No

As nouns, devil's flax and Linaria vulgaris are synonyms defined as:

devil's flax and Linaria vulgaris: common European perennial having showy yellow and orange flowers; a naturalized weed in North America

Other synonyms of devil's flax include butter-and-eggs, toadflax, wild snapdragon.

devil's flax (noun)	Linaria vulgaris (noun)
common European perennial having showy yellow and orange flowers; a naturalized weed in North America	common European perennial having showy yellow and orange flowers; a naturalized weed in North America