hour angle vs astronomy

hour angle and astronomy both are nouns.

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

hour angle (noun)	astronomy (noun)
the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body	the branch of physics that studies celestial bodies and the universe as a whole
(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