inquisitiveness vs curiosity

inquisitiveness and curiosity both are nouns.

Word	Noun	Adjective	Verb	Adverb
inquisitiveness	Yes	No	No	No
curiosity	Yes	No	No	No

As nouns, curiosity is a hypernym of inquisitiveness; that is, curiosity is a word with a broader meaning than inquisitiveness:

Other hypernyms of inquisitiveness include wonder.

inquisitiveness (noun)	curiosity (noun)
The quality of being curious and interested.	something unusual -- perhaps worthy of collecting
a state of active curiosity	a state in which you want to learn more about something