vacuity vs senselessness

vacuity and senselessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacuity	Yes	No	No	No
senselessness	Yes	No	No	No

As nouns, vacuity and senselessness are synonyms defined as:

Other synonyms of vacuity include inanity, mindlessness, pointlessness.

vacuity (noun)	senselessness (noun)
total lack of meaning or ideas	total lack of meaning or ideas
a region that is devoid of matter
the absence of matter