Haunt, Heyday, Hindsight

Haunt：お化けが出没する；考えが心に浮かぶ；よく訪れる；しょっちゅうつき合う；悩ます。   The old temple is said to be haunted. Memories of love haunted me. Mike haunted the galleries and bars that the artists went to.  Mary haunted famous men, hoping to gain celebrity for herself. My youthful escapades came back to haunt me.

Heyday：盛り、全盛期。

　　The 1940s were the heyday for the chemists and chemical engineers.

Hindsight：後知恵。

　　It is easier to have hindsight than foresight (ゲスの後知恵).