pom-pom vs adornment

pom-pom and adornment both are nouns.

Word	Noun	Adjective	Verb	Adverb
pom-pom	Yes	No	No	No
adornment	Yes	No	No	No

As nouns, adornment is a hypernym of pom-pom; that is, adornment is a word with a broader meaning than pom-pom:

pom-pom: decoration consisting of a ball of tufted wool or silk; usually worn on a hat
adornment: a decoration of color or interest that is added to relieve plainness

pom-pom (noun)	adornment (noun)
artillery designed to shoot upward at airplanes	the action of decorating yourself with something colorful and interesting
decoration consisting of a ball of tufted wool or silk; usually worn on a hat	a decoration of color or interest that is added to relieve plainness