sweet cicely vs herb

sweet cicely and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet cicely	Yes	No	No	No
herb	Yes	No	No	No

As nouns, herb is a hypernym of sweet cicely; that is, herb is a word with a broader meaning than sweet cicely:

sweet cicely: fresh ferny leaves and green seeds used as garnish in salads and cold vegetables; dried seeds used in confectionery and liqueurs
herb: aromatic potherb used in cookery for its savory qualities

As nouns, herb is a hypernym of sweet cicely; that is, herb is a word with a broader meaning than sweet cicely:

sweet cicely: European herb with soft ferny leaves and white flowers
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of sweet cicely include herbaceous plant.

sweet cicely (noun)	herb (noun)
fresh ferny leaves and green seeds used as garnish in salads and cold vegetables; dried seeds used in confectionery and liqueurs	aromatic potherb used in cookery for its savory qualities
European herb with soft ferny leaves and white flowers	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
aromatic resin that is burned as incense and used in perfume