Is This Nonsense?

Is a limerick milk and rice? It is in letter form. Will a butterfly flutter by as pastel petals fall? Astronomers, the moon-starers, Say, “Yay! Cat’s ecstasy!” Do canoes that ply the oceans show discretion in directions? Be silent now, and listen still, to bather’s pacing breaths. The tall and solitary royalist reigns; but, will he resign? Hear the minstrel, Mr Silent, make a testament and statement: “This is a play on jumbling words: it's Anagramalia!”