Fruit fly and Firefly

Fruit fly noun - Any of numerous small insects whose larvae feed on fruits.

Firefly and fruit fly are semantically related. In some cases you can use "Firefly" instead a noun phrase "Fruit fly".

Firefly noun - Tropical American click beetle having bright luminous spots.

Fruit fly and firefly are semantically related. Sometimes you can use "Fruit fly" instead a noun "Firefly".