There are several synonyms for the phrase "nine times," which is typically used to describe a multiplication factor. One option is to simply say "ninefold," which means "increased by a factor of nine." Another option is to use the phrase "nine instances," as in "the number of accidents increased by nine instances compared to last year." "Ninefold" and "nine instances" are both synonyms for "nine times" that can be used interchangeably in many contexts. Other possible synonyms include "nine-fold increase," "ninefold growth," and "multiplied by nine".