The snam suad is an eight-line Irish poem form with an aabcdddc rhyme scheme. It has exactly 24 syllables (three per line) and generally attempts to follow Irish traditions such as cywddydd (harmony of sound) and the inclusion of dunadh (a type of refrain).
The treochair is an Irish poem form consisting of three-line stanzas in which both the stresses and syllable counts are traditionally counted. Each verse has a 3-7-7 syllable pattern, with the first and third lines rhyming with each other. The traditional “harmony of sound” that Irish forms pride themselves on is expected.