merrymaking vs hijinks

merrymaking and hijinks both are nouns.

Word	Noun	Adjective	Verb	Adverb
merrymaking	Yes	No	No	No
hijinks	Yes	No	No	No

As nouns, hijinks is a hyponym of merrymaking; that is, hijinks is a word with a more specific, narrower meaning than merrymaking:

Other hyponyms of merrymaking include high jinks, high jinx, jinks, revel, revelry.

merrymaking (noun)	hijinks (noun)
a boisterous celebration; a merry festivity	noisy and mischievous merrymaking