Relay

реле

rele

(electrical actuator)

смяна

smjana

(a new set of anything that can be used to relieve the existing set when worn out)

щафета

štafeta

(athletics discipline)

ретранслирам

retransliram

(to pass on or transfer (information))

сменям

smenjam

(to place (people or horses) in relays)