"Blueback" is also applied to sockeye and, in some areas to sea-run
cutthroat. Back in the 'fifties, when there was a good fishery for them off
Posession Point in the spring (usually with pop gear and worms), resident
coho were "feeder silvers". Silver is commonly applied to kokanee, but at
various times the WDFW has stocked some lowland lakes with coho as well.
Does that make it a silver- silver as opposed to a sockeye-silver (or maybe
cohokanee)? Sea run cutthroat, by the way are also referred to as "harvest
trout", especially in Southwest Washington, because of the time they enter
the rivers.