declination vs astronomy

declination and astronomy both are nouns.

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

declination (noun)	astronomy (noun)
a polite refusal of an invitation	the branch of physics that studies celestial bodies and the universe as a whole
(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
a downward slope or bend
a condition inferior to an earlier condition; a gradual falling off from a better state; decline