declination vs refusal

declination and refusal both are nouns.

Word	Noun	Adjective	Verb	Adverb
declination	Yes	No	No	No
refusal	Yes	No	No	No

As nouns, refusal is a hypernym of declination; that is, refusal is a word with a broader meaning than declination:

Other hypernyms of declination include acknowledgement, acknowledgment.

declination (noun)	refusal (noun)
a polite refusal of an invitation	a message refusing to accept something that is offered
(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere	the act of refusing
a downward slope or bend
a condition inferior to an earlier condition; a gradual falling off from a better state; decline