S: (n) defense, defence (the act of defending someone or something against attack or injury) "a good boxer needs a good defense"; "defense against hurricanes is an urgent problem"
S: (n) defense, defence (protection from harm) "sanitation is the best defense against disease"
S: (n) inoculating, vaccinating (the act of protecting against disease by introducing a vaccine into the body to induce immunity) "doctors examined the recruits but nurses did the inoculating"
S: (n) patrol (the activity of going around or through an area at regular intervals for security purposes)
S: (n) insulation (the act of protecting something by surrounding it with material that reduces or prevents the transmission of sound or heat or electricity)