First aid is an open compound word.
no
The accent is on the first syllable in the word "compound."
Ethane is a simple hydrocarbon compound that is not typically relevant to first aid. In a first aid context, ethane would not have a specific meaning or application.
first-rate
first aid is very important. It can save your life.
Palace
No. Kool-Aid is a mixture.
Driveway
Yes, they are separate words.
First aid
A bahuvrihi is a compound word in which the first part of the word modifies the second part of the word, but neither part conveys the original meaning of either of the two parts of the compound word.
There is nothing in the word to be separate parts so nothing can be compounded in the first place. A compound word has to have 2 parts that can stand alone but come together as one word. Example: into. In and to are separate but compound to make one.