scare
Word family
Synonym discussion
Sense: verb/1
All four words describe causing fear, but they differ in intensity and duration. 'Scare' and 'frighten' are the most common and interchangeable, though 'frighten' can feel slightly more formal or literary. 'Alarm' suggests a sharper sense of danger that prepares someone to act — you are alarmed by a fire alarm, not merely scared by it. 'Startle' is the briefest: a sudden noise startles you, but the feeling passes in a second. For everyday use: 'The dog scared the cat' sounds natural; 'The dog alarmed the cat' sounds too strong; 'The dog startled the cat' implies only a quick reaction, not lasting fear.
Common collocations
Etymology
The word 'scare' comes from the Old Norse word 'skirra', meaning to shrink from or to frighten. It entered Middle English as 'skerren' or 'scerren' and gradually took its modern form. The noun sense of 'a sudden fright' developed later, in the 1700s, while the public-panic meaning (as in 'bomb scare') emerged in the 1900s.