She couldn't conceal her annoyance when the project was delayed again.

annoyance 是动词 annoy（使恼怒）加上名词后缀 -ance 构成的名词，表示"恼怒、烦恼"的情绪状态。后缀 -ance 常用于将动词转化为表示状态或结果的名词。