lsjfl
valid
hairdo
There exist contraction in Spanish, just like they exist in English. Some spanish words though do not include the apostrophe when letters are removed. Any spanish word that ends in "ado" can occasionally have the 'd' removed to make it sound better. This often happens in Spanish reggaeton (a type of spanish rap) to make the song have better rythem. Callao therefore would actually be "callado" which is the spanish word for 'quiet'.
In English the largest word you can make is woaded, which uses six of the seven letters. There are no valid seven-letter combinations from the pattern a d d e h o w.
Daydream.
hared, heard
Divots
Sized
centrifuge
The letters 'lcodu' spell CLOUD.
The longest possible word is RADIOSONDE, which is ten letters long and is a unit of measurement for weather balloons. There's no word that can be made with all of those letters.