what is the difference between a hybrid and a comfort bike?

i know what road and mountain bikes are, I have seen hybrid and comfort used at times interchangeably and other times in contrast with each other.

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2012 VELO Mountain Bike Comfort Foam Handlebar bar Grips MTB Bicycle Blue New    US $.99

Huffy Avarice Womens 26 Inch Comfort Bike LOCAL PICKUP ONLY    US $43.00

Schwinn Miramar Womens Comfort Bike 26 Inch Wheels    US $54.00

1969 VINTAGE SCHWINN DELUXE TYPHOON BEACH CRUISER BIKE BICYCLE COMFORT CLASSIC    US $455.00