archangel vs angel

archangel and angel both are nouns.

Word	Noun	Adjective	Verb	Adverb
archangel	Yes	No	No	No
angel	Yes	No	No	No

As nouns, angel is a hypernym of archangel; that is, angel is a word with a broader meaning than archangel:

archangel: an angel ranked above the highest rank in the celestial hierarchy
angel: spiritual being attendant upon God

archangel (noun)	angel (noun)
an angel ranked above the highest rank in the celestial hierarchy	spiritual being attendant upon God
a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally	someone who provides financial support for some venture
	person of exceptional holiness