hymeneals vs observance

hymeneals and observance both are nouns.

Word	Noun	Adjective	Verb	Adverb
hymeneals	Yes	No	No	No
observance	Yes	No	No	No

As nouns, observance is a hypernym of hymeneals; that is, observance is a word with a broader meaning than hymeneals:

Other hypernyms of hymeneals include ceremonial, ceremonial occasion, ceremony.

hymeneals (noun)	observance (noun)
the social event at which the ceremony of marriage is performed	the act of observing; taking a patient look
	conformity with law or custom or practice etc.
	the act of noticing or paying attention
	a formal event performed on a special occasion