Indeed it is. It means the most busy.
Today was his busiest workday all month.
busy
No, the word 'busiest' is the superlative form of the adjective busy (busier, busiest).The abstract noun form of the adjective 'busy' is business.
They are "busier" and "busiest".
busiest, busings
Busiest what? New York has the busiest stock exchange. Florida has the busiest funeral directors. California has the busiest movie industry.
Where is the busiest sreet in Paris
what is the busiest port of Africa
The Port of Felixstowe is the busiest port in England, the 6th busiest in Europe and the 35th busiest in the world.
Heathrow (EGLL) is presently the busiest.
Busiest highway in nj
People always seem to want me when I'm at my busiest.The shop was always the busiest around Christmas.