astrometry vs astronomy

astrometry and astronomy both are nouns.

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

As nouns, astronomy is a hypernym of astrometry; that is, astronomy is a word with a broader meaning than astrometry:

astrometry: the branch of astronomy that deals with the measurement of the position and motion of celestial bodies
astronomy: the branch of physics that studies celestial bodies and the universe as a whole

Other hypernyms of astrometry include uranology.

astrometry (noun)	astronomy (noun)
the branch of astronomy that deals with the measurement of the position and motion of celestial bodies	the branch of physics that studies celestial bodies and the universe as a whole