garland vs adorn

garland is a noun but adorn is not a noun.

Word	Noun	Adjective	Verb	Adverb
garland	Yes	No	Yes	No
adorn	No	No	Yes	No

As verbs, adorn is a hypernym of garland; that is, adorn is a word with a broader meaning than garland:

Other hypernyms of garland include beautify, decorate, embellish, grace, ornament.

garland (noun)	adorn (noun)
flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes
an anthology of short literary pieces and poems and ballads etc.

garland (verb)	adorn (verb)
adorn with bands of flowers or leaves	make more attractive by adding ornament, colour, etc.
	furnish with power or authority; of kings or emperors
	be beautiful to look at