• dly ash,
• cly ash,
• vly ash,
• gly ash,
• tly ash,
• rly ash,
• fky ash,
• fpy ash,
• foy ash,
• flt ash,
• flg ash,
• flh ash,
• flu ash,
• fl7 ash,
• fl6 ash,
• fly zsh,
• fly ssh,
• fly wsh,
• fly qsh,
• fly aah

The adjective form of "fly ash" is "fly-ash". It is a compound adjective formed by combining the noun "fly" with the noun "ash".

The plural form of the word "fly ash" is "fly ashes".

The singular form of "fly ash" is "fly ash". The word "fly" itself is already a singular noun, and "ash" is also a collective noun for the fine powdery residue that remains after combustion. Thus, "fly ash" does not change when referring to one unit of it.