In a case of hyponymy, mention which word is the hyponym; in a case of antonymy, tell what kind of antonymy it is [closed]

There is a definition of "hyponymy" in Wikipedia.

In linguistics, a hyponym (from Greek hupó, "under" and ónoma, "name") is a word or phrase whose semantic field is included within that of another word, its hyperonym or hypernym (from Greek hupér, "over" and ónoma, "name"). In simpler terms, a hyponym is in a type-of relationship with its hypernym.

For instance, "animal" stands in a relation of hypernymy to "cow" because a cow is a sort of animal. (Similarly "cow" stands in a relation of hyponymy to "animal".)
Night is not a sort of day and vice versa. So, there is no relation of hyponymy for those two.

There is a relation of antonymy between "night" and "day" (ref.).
There are three types of antonyms (ThoughtCo):
-- 1/ gradable, they operate on a continum (tall, short),
-- 2/ complementary, those express an either/or relationship (dead/alive)
-- 3/ converse or relational, and those express reciprocity (plus/minus, husband/wife, borrow/lend).
Must first be determined what is meant by night. Fundamental meanings are "the darkness which prevails during the period from sunset to dawn, also called night and "the period" itself.
If the darkness is what is meant, the particular sort of antonymy is gradable (progressive change from night to day). If the period is meant the sort of antonymy must be complementary (it's either night or day).