Bivoltine is a relatively uncommon word that describes insects that produce two generations in a single year. However, there are several synonyms that can be used in place of this term. For instance, "semivoltine" describes insects that produce only one generation per year, while "trivoltine" refers to species that produce three generations. "Multivoltine" is used to describe insects that produce many generations throughout a year. Alternatively, "semelparous" describes insects that reproduce only once in their lifetime. These synonyms can be useful when discussing the lifecycle of different insects, and can offer a more varied vocabulary for those with an interest in entomology.