directionality vs directivity

directionality and directivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
directionality	Yes	No	No	No
directivity	Yes	No	No	No

As nouns, directionality and directivity are synonyms defined as:

directionality and directivity: the property of a microphone or antenna of being more sensitive in one direction than in another

directionality (noun)	directivity (noun)
the property of a microphone or antenna of being more sensitive in one direction than in another	the property of a microphone or antenna of being more sensitive in one direction than in another
the property of being directional or maintaining a direction	the quality of being directive