Giant, gigantic, or gargantuan.
genetic or geographical
Car is another word for truck that starts with a "c".
Plethora
Another word for addition which starts with the letter N is New.
"Sleuth" is another word for detective that starts with "sl".
Another word for elevation is altitude.
Another word for water that starts with the letter 'O' is oxygen dihydrogen.
Try "Huge".
Huge;
charm
Another word for a blimp that starts with a Z is a Zeppelin
Authority can be used as another word for expert and starts with an "A". Example: An authority on the subject of crime, notes that...