galaxy vs accumulation

galaxy and accumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
galaxy	Yes	No	No	No
accumulation	Yes	No	No	No

As nouns, accumulation is a hypernym of galaxy; that is, accumulation is a word with a broader meaning than galaxy:

galaxy: (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
accumulation: several things grouped together or considered as a whole

Other hypernyms of galaxy include aggregation, assemblage, collection.

As nouns, accumulation is a hypernym of galaxy; that is, accumulation is a word with a broader meaning than galaxy:

Other hypernyms of galaxy include aggregation, assemblage, collection.

galaxy (noun)	accumulation (noun)
(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust	the act of accumulating
a splendid assemblage (especially of famous people)	several things grouped together or considered as a whole
tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition