common fennel vs common fennel

common fennel and common fennel both are nouns.

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

common fennel (noun)	common fennel (noun)
leaves used for seasoning	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