caistealcastlemasculine noun
- the
- an caisteal
- after a preposition
- a' chaisteal
- of the
- a' chaisteil
- plural
- caistealan
- the (plural)
- na caistealan
Also the chess rook, the castle.
Every form but the headword, the genitive and the plural is worked out by the spelling rules in the grammar guide, so what you see here is what the guide teaches. Awaiting a fluent speaker’s review.