Most dictionaries spell the compound noun "race car" as two separate words, but there is also "racecar" as one word on a lot of websites. My question is: is it ok to use it as one word "racecar"?
Racecar is about skirting the line of dropping the space. Soon it will be like database, telephone, auto mobile, or to-morrow. So, signs point to effectively 1 word for early adopters, though it is still listed as 2 in some references.