archangel vs garden angelica

archangel and garden angelica both are nouns.

Word	Noun	Adjective	Verb	Adverb
archangel	Yes	No	No	No
garden angelica	Yes	No	No	No

As nouns, archangel and garden angelica are synonyms defined as:

archangel and garden angelica: a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally

Other synonyms of archangel include Angelica Archangelica.

archangel (noun)	garden angelica (noun)
an angel ranked above the highest rank in the celestial hierarchy	a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally
a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally