fullness vs infestation

fullness and infestation both are nouns.

Word	Noun	Adjective	Verb	Adverb
fullness	Yes	No	No	No
infestation	Yes	No	No	No

As nouns, infestation is a hyponym of fullness; that is, infestation is a word with a more specific, narrower meaning than fullness:

Other hyponyms of fullness include repletion, satiation, satiety, excess, overabundance, surfeit, solidity.

fullness (noun)	infestation (noun)
greatness of volume	a swarm of insects that attack plants
the property of a sensation that is rich and pleasing	the state of being invaded or overrun by parasites
the condition of being filled to capacity
completeness over a broad scope