common fennel vs Foeniculum vulgare

common fennel and Foeniculum vulgare both are nouns.

Word	Noun	Adjective	Verb	Adverb
common fennel	Yes	No	No	No
Foeniculum vulgare	Yes	No	No	No

As nouns, common fennel and Foeniculum vulgare are synonyms defined as:

common fennel and Foeniculum vulgare: strongly aromatic with a smell of aniseed; leaves and seeds used for seasoning

common fennel (noun)	Foeniculum vulgare (noun)
leaves used for seasoning	strongly aromatic with a smell of aniseed; leaves and seeds used for seasoning
strongly aromatic with a smell of aniseed; leaves and seeds used for seasoning