Left field and Off-base

Left field noun - The piece of ground in the outfield on the catcher's left.

Off-base and left field are semantically related. In some cases you can use "Off-base" instead an adjective phrase "Left field".

Off-base adjective - Located outside a military base.

Left field and off-base are semantically related. Sometimes you can use "Left field" instead an adjective phrase "Off-base".