directivity vs radial asymmetry

directivity and radial asymmetry both are nouns.

Word	Noun	Adjective	Verb	Adverb
directivity	Yes	No	No	No
radial asymmetry	Yes	No	No	No

As nouns, radial asymmetry is a hypernym of directivity; that is, radial asymmetry is a word with a broader meaning than directivity:

directivity: the property of a microphone or antenna of being more sensitive in one direction than in another
radial asymmetry: the absence of symmetry about an axis

directivity (noun)	radial asymmetry (noun)
the property of a microphone or antenna of being more sensitive in one direction than in another	the absence of symmetry about an axis
the quality of being directive