Skribbl.io is a free browser drawing and guessing game. In a private room you can paste your own comma-separated custom words, and this page gives themed lists to copy.
Words of Wonders Online Game Web explains Words of Wonders by Fugo Games, a free crossword app where you swipe letters into words and unlock world landmarks level by level.
Words of Wonders Web Version Free explains Words of Wonders, a free crossword puzzle game where you connect letters to fill word grids while visiting world landmarks like the Seven Wonders.