aeration vs change of state

aeration and change of state both are nouns.

Word	Noun	Adjective	Verb	Adverb
aeration	Yes	No	No	No
change of state	Yes	No	No	No

As nouns, change of state is a hypernym of aeration; that is, change of state is a word with a broader meaning than aeration:

aeration: the act of charging a liquid with a gas making it effervescent
change of state: the act of changing something into something different in essential characteristics

aeration (noun)	change of state (noun)
the act of charging a liquid with a gas making it effervescent	the act of changing something into something different in essential characteristics
the process of exposing to air (so as to purify)