astronomy vs hour angle

astronomy and hour angle both are nouns.

Word	Noun	Adjective	Verb	Adverb
astronomy	Yes	No	No	No
hour angle	Yes	No	No	No

astronomy (noun)	hour angle (noun)
the branch of physics that studies celestial bodies and the universe as a whole	the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body
	(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day