overgrowth vs cornucopia

overgrowth and cornucopia both are nouns.

Word	Noun	Adjective	Verb	Adverb
overgrowth	Yes	No	No	No
cornucopia	Yes	No	No	No

As nouns, cornucopia is a hypernym of overgrowth; that is, cornucopia is a word with a broader meaning than overgrowth:

Other hypernyms of overgrowth include profuseness, profusion, richness.

overgrowth (noun)	cornucopia (noun)
a profusion of growth on or over something else	the property of being extremely abundant
excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland	a goat's horn filled with grain and flowers and fruit symbolizing prosperity