What is the abstract noun of adjective fly?

Answer 1

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.