Similarities
* Grammar: Both Irish and Scottish Gaelic have similar grammatical structures, including the use of verb-noun-adjective word order, the use of particles to mark tense and mood, and the use of a complex system of case endings.
* Vocabulary: Many words are shared between Irish and Scottish Gaelic, especially in the areas of everyday life, nature, and culture. For example, the Irish word for "house" is "teach", while the Scottish Gaelic word is "taigh".
* Pronunciation: While the pronunciation of Irish and Scottish Gaelic can differ, there are also many similarities. For example, the letter "c" is pronounced as a "k" in both languages, and the letter "t" is pronounced as a "d" in both languages.
Differences
* Vocabulary: There are also many words that are unique to each language. For example, the Irish word for "mountain" is "sliabh", while the Scottish Gaelic word is "beinn".
* Pronunciation: Some of the pronunciation differences between Irish and Scottish Gaelic are due to differences in the spelling of words. For example, the Irish word "céad" is pronounced as "kay-ad", while the Scottish Gaelic word "ciad" is pronounced as "kee-ad".
* Grammar: There are also some grammatical differences between Irish and Scottish Gaelic. For example, the Irish language uses the future tense more frequently than the Scottish Gaelic language.
Overall, Irish and Scottish Gaelic are closely related languages, but they are not mutually intelligible. However, there are many similarities between the two languages, and they share a common ancestor.