Sunfish and Sailboat

Sunfish noun - Small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies; black bass; bluegills; pumpkinseed.

Sailboat and sunfish are semantically related In some cases you can replace term "Sailboat" with "Sunfish", this nouns are similar.

Sailboat noun - A boat equipped with one or more sails.

Sunfish and sailboat are semantically related in boat propelled with wind by sailcloth topic. You can use "Sunfish" instead a noun "Sailboat".