garland vs ornament

garland and ornament both are nouns.

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

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

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

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

garland (verb)	ornament (verb)
adorn with bands of flowers or leaves	make more attractive by adding ornament, colour, etc.
	be an ornament to