What is the abstract noun of adjective fly?

The Word fly (and the plural flies) is the noun form, a common concrete noun, a Word for an insect.

The abstract noun form for the verb to fly is flyability.

The Word fly is not an adjective; terms such as flypaper or fly-by are compound Words. The adjective forms are the present participle, flying, and the past participle flown.

And, last but not least, the Word 'fly' used as an adjective is a slang term.