How to spell NASTLING correctly?

If you're searching for the correct spelling of "nastling", it seems that you might be referring to "nestling". A nestling is a young bird that hasn't yet left its nest. The word "nastling" doesn't have a recognized meaning, so "nestling" is likely what you were looking for.

• castling In chess, castling is a move that allows the player to simultaneously move the king and one of the rooks.
• nestling The mother bird made sure to keep a watchful eye on her nestling as it learned to fly for the first time.

Asing

• acing
• aging
• aping
• arcing
• ask in
• asking
• assign
• assn
• awing
• axing