IPA: /ˈspaɪkər/
KK: /ˈspaɪkər/
A person who drives spikes into the ground, often used in the context of rail construction.
The spiker worked diligently to secure the rails in place.
The word 'spiker' is derived from 'spike' (from Middle English *spik*, meaning a sharp point or a nail) and the suffix '-er' (meaning a person who). A spiker is a person or thing that spikes, or adds sharp points to something.
Think of someone who adds sharp points ('spike') to something — that's what a spiker does.