1.  burglar alarm(n = noun.communication) - a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"
is a kind of alarm, alarum, alert, warning signal

2.  burglar alarm(n = noun.artifact) - a warning device that is tripped off by the occurrence of a burglary;
is a kind of alarm, alarm system, warning device

alarm, alarm bell, alarm clock, alarm system, burglar, cat burglar, false alarm, fire alarm, smoke alarm