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rìghkingmasculine noun
the
an rìgh
after a preposition
an rìgh
of the
an rìgh
plural
rìghrean
the (plural)
na rìghrean

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.