Yes it is.
1 word
a racetrack is called 'un circuit' (masc.) in FrenchIn auto racing, the term "Circuit" is used to describe a racetrack (e.g. le circuit Bugatti at the "le Mans" site).When referring to the actual black top, the word "piste" can also be used.
According to a number of respected reference resources, including the Random House Dictionary, it can be spelled correctly as either one word or two words; both are acceptable. (Note, however, that not all dictionaries include the compound word.)
Example : cupcake handbag highschool racetrack RUNWAY jellyfish popsiclestick boardwalk basketball
Chicane
In auto racing, the term "Circuit" is used to describe a racetrack (e.g. le circuit Bugatti at the "le Mans" site). When referring to the actual black top, the word "piste" can also be used.
Speeding
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
Upstairs is a compound word, so it is one word.