war·fare 
/ˈwoɚˌfeɚ/ noun
/ˈwoɚˌfeɚ/ noun [noncount] 1 : military fighting in a war
▪ guerrilla warfare ▪ nuclear warfare — see also biological warfare, chemical warfare, psychological warfare at psychological 2 : activity that is done as part of a struggle between competing groups, companies, etc.
▪ industrial warfare ▪ gang warfare ▪ economic warfare
▪ guerrilla warfare ▪ nuclear warfare — see also biological warfare, chemical warfare, psychological warfare at psychological
▪ industrial warfare ▪ gang warfare ▪ economic warfare
