sickness vs queasiness

sickness and queasiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sickness	Yes	No	No	No
queasiness	Yes	No	No	No

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

Other hyponyms of sickness include kinetosis, motion sickness, morning sickness, qualm, squeamishness.

sickness (noun)	queasiness (noun)
impairment of normal physiological function affecting part or all of an organism	inability to rest or relax or be still
the state that precedes vomiting	a mild state of nausea
defectiveness or unsoundness