vegetation vs aggregation

vegetation and aggregation both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetation	Yes	No	No	No
aggregation	Yes	No	No	No

As nouns, aggregation is a hypernym of vegetation; that is, aggregation is a word with a broader meaning than vegetation:

Other hypernyms of vegetation include accumulation, assemblage, collection.

vegetation (noun)	aggregation (noun)
inactivity that is passive and monotonous, comparable to the inactivity of plant life	the act of gathering something together
an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)	several things grouped together or considered as a whole
all the plant life in a particular region or period
the process of growth in plants