pectoral vs adornment

pectoral and adornment both are nouns.

Word	Noun	Adjective	Verb	Adverb
pectoral	Yes	Yes	No	No
adornment	Yes	No	No	No

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

pectoral: an adornment worn on the chest or breast
adornment: a decoration of color or interest that is added to relieve plainness

pectoral (noun)	adornment (noun)
an adornment worn on the chest or breast	the action of decorating yourself with something colorful and interesting
either of two large muscles of the chest	a decoration of color or interest that is added to relieve plainness

pectoral (adjective)	adornment (adjective)
of or relating to the chest or thorax