Definitely not!
A "bluebird".
Bluebird
A bluebird?
It is bluebird!
That is the proper spelling of the word feathers (bird plumage).
No, building is not a compound word.
The contraction (not a compound word) is doesn't.
Upwards is a compound word.
There is no compound word.A compound word is a word like bus-stop.Husban is spelt like this husband
The noun 'feathers' is a neuter noun, a word for something that has no gender.
Upstairs is a compound word, so it is one word.