alarm clock [noun] [de wekker, de wekkers]
"Wekker" is the noun that goes with the verb "wekken" (see ‘Related words’).
Examples:
1. "Wekkerradio": radio alarm (clock).
2. "Hoe laat heb je de wekker gezet?"
("For what time did you set the alarm?")
3. "Ik heb de wekker op 7 uur gezet."
("I have set the alarm for 7 o’clock.")
Related words:
1. "Wekken": to wake somebody up.
Example: "Je moet je vader om 6 uur wekken."
("You have to wake up your father at 6 o’clock.")
2. "Wakker": awake.
3. "Wakker worden": to wake up.