prank vs ornament

prank and ornament both are nouns.

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

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

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

prank (noun)	ornament (noun)
a ludicrous or grotesque act done for fun and amusement	something used to beautify
acting like a clown or buffoon

prank (verb)	ornament (verb)
dress up showily	make more attractive by adding ornament, colour, etc.
dress or decorate showily or gaudily	be an ornament to