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| 77. | cailleaċ, a hag. | |
| SINGULAR. | PLURAL. | |
| Nom. & Acc. | cailleaċ | cailleaċa |
| Gen. | cailliġe | cailleaċ |
| Dat. | cailliġ | cailleaċaiḃ |
| Voc. | a ċailleaċ | a ċailleaċa |
78. Like nouns of 1st declension, the vowels of the nom. sing. are sometimes changed when the final consonant is attenuated in the genitive singular.
The following are the chief changes:—
| Change | io | in the nom. sing. | into | i | in the gen. sing. |
| „ | eu | „ | „ | éi | „ |
| „ | ia | „ | „ | éi | „ |
| „ | o (short) sometimes | „ | ui | „ | |
In words of one syllable change ea into ei (but cearc, a hen, becomes circe); in words of more than one syllable change ea into i.
| 79. | beaċ, a bee. | |
| SINGULAR. | PLURAL. | |
| Nom. & Acc. | beaċ | beaċa |
| Gen. | beiċe | beaċ |
| Dat. | beiċ | beaċaiḃ |
| Voc. | a ḃeaċ | a ḃeaċa |
| 80. | geug, a branch. | |
| Nom. & Acc. | geug | geuga |
| Gen. | géige | geug |
| Dat. | géig | geugaiḃ |
| Voc. | a ġeug | a ġeuga |
